Summarize this article with:
Every facebook ads vs google ads comparison article ends with “use both.” That’s technically correct and almost entirely useless. It doesn’t tell you which platform to start with when you have $2,000 to spend this month. It doesn’t tell you what signal in your data means it’s time to add the second platform. And it definitely doesn’t tell you what happens when your ROAS is fine on paper but your blended attribution is lying to you.
I manage paid search and Shopping campaigns alongside Meta campaigns for ecommerce clients across the USA, UK, UAE, and Australia. ThePetsClub UAE ran to 14x ROAS. ArmorGarage hit 1,500%+ on Performance Max. P-REX Hobby hit 9x. All of those results came from running the two platforms as a system, not in isolation. Here’s what that system actually looks like.
What makes Facebook Ads and Google Ads genuinely different
The core distinction in the facebook ads vs google ads debate isn’t targeting or creative format. It’s intent.
Google Ads, specifically Google Shopping and Search, reaches people who are already looking for what you sell. Someone types “garage floor coating epoxy” into Google. They want to buy a garage floor coating. Your Shopping ad appears. That search-to-click-to-purchase path is short. Google Search Ads convert at around 4.4% on average across industries. Google Shopping, depending on the product category, delivers 4x to 8x ROAS on average. The mechanics work because the intent is already there.
Facebook Ads, now running through Meta’s ad platform, reaches people who aren’t searching for anything. They’re scrolling. Your ad interrupts that scroll with something visually interesting. The purchase decision, if it happens, usually requires multiple exposures. Facebook’s average purchase conversion rate runs 1 to 3% for ecommerce. Average ROAS on Facebook ecommerce campaigns runs 1.5x to 4x, with higher performance when creative quality is strong and retargeting audiences are well-segmented.
Neither platform is better. They address different parts of the customer journey.
Google is demand capture. When someone knows what they want, Google helps them find it. Your Shopping ad for “P-REX axle”, “garage floor epoxy”, or “raw dog food delivery UAE” captures that active search intent. If you sell a product that people actively search for, Google Shopping gets you in front of buyers at the highest-intent moment in the entire purchase funnel.
Facebook is demand creation. When your product solves a problem people didn’t know they had, or when you’re trying to reach an audience that hasn’t started searching yet, Facebook shows your product to people who match your buyer profile. A skincare brand selling a $65 serum isn’t going to find buyers by waiting for search intent. They need to interrupt a scroll, create curiosity, and build brand recognition before the purchase decision gets made.
The tactical question, then, is: which one do you build first, and why?
Why most ecommerce brands set up both platforms wrong from the start
The most common mistake isn’t platform choice. It’s budget split before either platform has enough data.
Google’s Smart Bidding (Target ROAS, Maximize Conversion Value, Performance Max) and Meta’s Advantage+ Shopping Campaigns both require conversion volume to learn. The threshold is roughly 15 to 50 conversions per month per campaign for the algorithm to optimize properly. Below that, the AI is guessing. The practical implication: you need at least $2,000 to $3,000 per month per platform to generate enough conversions to train the bidding system on most ecommerce accounts. Many brands split $3,000 across both platforms, starve both algorithms, and then blame the platforms when performance is weak.
The fix is concentration. If your monthly paid ad budget is under $5,000, pick one platform and run it until it’s profitable. Then add the second.
Which one you start with depends on one question: do people already search for your product?
If yes, start with Google Shopping. A product with active search volume gets immediate, high-intent traffic from Shopping ads. Shopping campaigns generate revenue faster than any other ad format in paid advertising. Google Shopping has the highest average ROAS of any ad format on either platform, running 4x to 8x for most ecommerce categories. Hustle Marketers’ e-commerce PPC management service is built around this exact sequencing, starting with Shopping, then layering in Performance Max when Shopping data is established.
If no, start with Facebook. Discovery products, novel supplements, trending lifestyle items, and anything that needs visual demonstration don’t have search volume because buyers don’t know the product exists yet. Facebook Advantage+ Shopping Campaigns find people who look like your customers and show them your product at scale. Facebook builds the awareness that eventually creates search demand. Once people start searching for your brand name on Google, that’s usually a signal your Facebook campaigns are working.
The second most common mistake: treating the platforms as competitors for credit. Both ad managers claim the same sales. Facebook claims the sale because the user saw a Facebook ad. Google claims it because the user later clicked a Google Shopping ad before purchasing. Your ROAS in both platforms looks great, but the combined spend-to-revenue math doesn’t work. This is the attribution problem that every facebook ads vs google ads comparison glosses over. The only fix is third-party attribution using a tool like Northbeam, Triple Whale, or Wicked Reports. Without it, you’re making budget decisions based on double-counted revenue.
When to add the second platform
The signal isn’t time-based. It’s data-based.
Add Google when your Facebook campaigns are profitable (ROAS above your breakeven margin threshold) and you’ve confirmed search volume exists for your products. At that point, Facebook has built enough brand awareness to generate branded searches, and Google Shopping can harvest that intent with very high ROAS on branded terms.
Add Facebook when your Google campaigns have plateaued. Once you’ve captured most available search volume for your category, Google spend efficiency flattens. Facebook campaigns can then create new demand by reaching people who haven’t yet started searching. Hustle Marketers’ calculate break-even ROAS guide covers the margin-first framework you need before adding any second platform.
How to structure campaigns on each platform for ecommerce
The right campaign structure on each platform is different, and getting it wrong on one while running both creates the attribution mess that kills performance.
1. Start Google Shopping before Google Search. Shopping ads show product images, prices, and reviews directly in search results. They drive higher CTR and conversion rates for most ecommerce categories than text-based Search ads. After Shopping is profitable, layer in Search campaigns for branded queries (your brand name + product type) and competitor conquesting on high-commercial-intent terms. Don’t start with broad Search campaigns on cold audiences. Start with Shopping, get conversion data, then expand. Hustle Marketers’ ArmorGarage case study shows how we rebuilt Shopping campaigns and then moved to Performance Max, hitting 1,500%+ ROAS within 90 days on a BigCommerce store.
2. Use Performance Max after Shopping has established conversion data. Performance Max runs across all Google inventory (Search, Shopping, Display, YouTube, Gmail, Maps) from a single campaign. The algorithm is powerful, but it needs 30 to 50 conversions from your Shopping campaigns first to understand what a conversion looks like before you hand it more inventory to explore. Starting with PMax on a cold account produces inconsistent early results. Starting with Shopping first, then upgrading to PMax with existing conversion data, is the sequencing that consistently produces the highest ROAS in my accounts. Target ROAS settings matter here too. Set them at or below your historical conversion value per cost, not at aspirational levels.
3. Run Facebook Advantage+ Shopping Campaigns as your primary Meta campaign type. ASC is Meta’s AI-driven campaign equivalent to Performance Max. It allocates budget across prospecting and retargeting automatically, tests creative variations, and finds your highest-converting audiences without requiring manual audience segmentation. For most ecommerce accounts, ASC outperforms manually structured campaigns. Start with your best 3 to 5 creative assets (static images, short video, carousels), give the algorithm $50 to $100 daily minimum, and let it run for at least 14 days before evaluating. ROAS for ASC on ecommerce typically lands at 2.5x to 5x depending on product price point, creative quality, and how warm the audience is.
4. Separate your retargeting from your prospecting on Meta. Advantage+ Shopping handles both automatically, but if you’re running manual campaigns, keep retargeting (website visitors, add-to-cart abandoners, existing customers) in a separate campaign from cold prospecting. Retargeting campaigns on Meta typically produce 3x to 4x higher ROAS than cold prospecting. The reason: people who already visited your site and didn’t buy are a much warmer audience than cold interest targeting. Keeping them separate lets you see the true ROAS of each audience tier and bid accordingly. Hustle Marketers’ P-REX Hobby case study shows Shopping as primary with Meta retargeting supporting it.
5. Set Target ROAS on Google campaigns based on your gross margin, not your ambition. The most common Google Ads error in ecommerce is setting Target ROAS above what the account can realistically achieve. If your historical ROAS on Shopping has been 4x and you set Target ROAS to 10x, Google’s algorithm enters fewer auctions because it’s looking for conversions it predicts will hit 10x. Impression volume drops, revenue drops, and you’re left wondering why performance went quiet. Set your target at or slightly below historical performance, especially after a platform change.
How attribution works differently on each platform, and why it matters
Both platforms use self-reported attribution that overlaps significantly.
Google’s default is Last Click within a 30-day conversion window. If a user clicked a Google Shopping ad on day 1, saw a Facebook retargeting ad on day 15, and purchased on day 20, Google claims the conversion. Facebook’s default is 7-day click, 1-day view. For the same purchase, if the user saw a Facebook ad, Google counts it, and Facebook also counts it.
The result is that your combined “reported ROAS” across both platforms is higher than your actual blended ROAS. When your accountant looks at revenue vs. total ad spend, the numbers are lower than what the ad managers show. This gap widens as you run both platforms simultaneously.
The only honest way to evaluate platform contribution is with incrementality testing (running dark periods on one platform to see if the other loses performance) or with a third-party attribution tool that assigns fractional credit. Until you have that data, use blended ROAS as your north star: total revenue divided by total ad spend across both platforms, tracked weekly.
What I’d check first when auditing a facebook ads vs google ads setup
When auditing a facebook ads vs google ads setup, start with blended ROAS. Not Google ROAS. Not Facebook ROAS. Total revenue divided by total ad spend across both platforms. If blended ROAS is below your breakeven margin threshold, one or both platforms is losing money regardless of what the individual dashboards show.
After that, check conversion volume per campaign. Any campaign running with fewer than 15 conversions in the last 30 days is operating on insufficient data. The algorithm is guessing. Either increase budget to hit the threshold or consolidate campaigns.
Then look at the product-platform match. High-AOV products ($100+) absorb Google’s higher CPC more easily. Lower-AOV products ($20 to $60) are often more profitable on Facebook where cheaper clicks keep the math working. If you’re running high-AOV products primarily on Facebook and lower-AOV products primarily on Google, you’ve got it backwards.
Finally, check your Target ROAS settings on Google against actual historical performance. If your settings are more than 20% above recent performance, your campaigns are volume-constrained and you’re leaving revenue on the table.
Realistic minimums for facebook ads vs google ads ecommerce
Each platform needs at least $2,000 to $3,000 monthly ad spend for Smart Bidding and Advantage+ algorithms to generate enough conversion data to optimize properly. Below that threshold, you’re feeding insufficient signal to the AI and results are inconsistent.
Google Shopping or Performance Max: $2,000 to $3,000 monthly minimum for enough conversion volume to train Smart Bidding. Below that, use manual CPC or Maximize Clicks until you’ve built a conversion history.
Facebook Advantage+ Shopping: $1,500 to $3,000 monthly minimum. Below $1,500, the algorithm doesn’t see enough impressions and clicks per day to optimize effectively. Daily minimum of $50 to $100 per campaign.
Agency management: $1,500 to $5,000 monthly per platform at most ecommerce-focused agencies, covering campaign structure, creative testing, bidding optimization, and weekly reporting.
Combined budget for dual-platform operation: $6,000 to $15,000 monthly total ad spend, plus management. Below that, concentrate spend on one platform first.
Creative production for Meta (images, video, copy variants): $500 to $3,000 monthly depending on how much testing you run. Facebook creative fatigue is real. Most accounts need 4 to 6 fresh creative assets monthly to prevent ad performance from declining as audiences saturate.
Why work with Ishant Sharma on Facebook Ads vs Google Ads
Twelve years. 500+ brands. $780M+ in trackable client revenue across both platforms. Google Partner and Meta Business Partner. Upwork Top Rated Plus with a 99% Job Success Score and a 5.0/5.0 rating. Clutch Award Winner 2024.
I run both channels simultaneously for the same clients and watch how they interact. ArmorGarage at 1,500%+ ROAS came from Google Performance Max after the Shopping foundation was built. ThePetsClub UAE at 14x ROAS came from a combined Google Shopping and Meta Advantage+ structure on Shopify Plus. P-REX Hobby at 9x ROAS came from Google Shopping as the primary channel with Meta retargeting supporting abandoned cart recovery.
None of those results came from one platform alone. And none of them came from running both platforms without a clear sequencing strategy. Every new engagement starts with a free $500 audit that covers platform-by-platform blended ROAS analysis, campaign structure review, Target ROAS validation, and channel sequencing recommendation. Hustle Marketers’ ecommerce PPC agency page covers how we structure these dual-platform engagements.
What to take from this
This facebook ads vs google ads decision isn’t a one-time choice that stays fixed. It’s a sequencing decision that evolves as your account matures.
Start with Shopping if your product has search volume. Run it until it’s profitable. Then add Performance Max. Then, when Shopping revenue has plateaued or you need to create new demand, layer in Facebook Advantage+ Shopping. Use blended ROAS, not platform-reported ROAS, as your decision metric. Get third-party attribution before you trust any individual platform’s numbers.
The brands that get the best results from this comparison aren’t the ones that “use both.” They’re the ones who run them as a coordinated system where Facebook creates the demand and Google captures it. That system requires knowing which platform to build first, when to add the second, and how to read attribution without letting both ad managers double-count your wins.
About Ishant Sharma
Ishant Sharma is a Google Ads specialist and Founder of Hustle Marketers, a Google Partner and Meta Business Partner agency working with e-commerce and lead-gen brands across the US, UK, UAE, and Australia. 12+ years in performance marketing. Trackable client revenue across his work has crossed $780 million. Upwork Top Rated Plus with a 99% Job Success Score and a 5.0/5.0 rating. Clutch Award Winner 2024. Based in Chandigarh, India.