Facebook Ads vs Google Ads

Facebook Ads and Google Ads are not really competitors; they do different jobs. Google Ads captures demand that already exists, showing your ad to someone who just typed what you sell. Facebook and Instagram Ads create demand, putting a product in front of people who were not looking but fit the profile. Google usually wins on intent and speed to conversion, Meta usually wins on reach and discovery, and the honest answer to "which is better" is that most profitable accounts run both and let one blended ROAS number decide the budget split. This is how to think about the two, and how to measure them so neither platform can flatter itself.

The core difference: capturing demand versus creating it

Everything else follows from one distinction. On Google Search, the customer starts the conversation. They type "waterproof hiking boots" and you bid to be the answer. The intent is already there; your job is to show up and not overpay for it. That is why search traffic converts at a higher rate and why it is the easier channel to measure. Someone searching for your category is close to a decision.

On Facebook and Instagram, you start the conversation. Nobody opened the app to buy your boots. You interrupt a feed with a photo, a video, or a testimonial and try to manufacture interest in people who match an audience. That is harder to attribute and slower to pay back, but it reaches buyers who would never have searched, and it is how genuinely new products find their first customers. Google cannot sell demand for a product nobody knows to look for yet.

So the two channels are complements far more than substitutes. Google harvests the intent that exists today, including the intent your Facebook ads created last month. Run only Google and you are limited by how many people already search. Run only Facebook and you leave the ready-to-buy searchers to a competitor.

Facebook Ads vs Google Ads at a glance

Cost: stop comparing cost per click

Facebook almost always shows a lower cost per click and a lower CPM than Google Search, and plenty of guides stop there and declare Facebook cheaper. That comparison is meaningless. You are not buying clicks, you are buying customers, and a cheap click that never converts costs more than an expensive one that does.

The right metric is cost per acquired customer, and then whether the revenue from those customers beats what you paid. On Google, a $4 click might convert at 6 percent for a $67 customer acquisition cost. On Facebook, a $0.90 click might convert at 1.2 percent for a $75 cost. Which is cheaper now? It depends entirely on your product, margins, and repeat rate, which is exactly the point: the platform-level cost tells you almost nothing about profitability. You have to measure it on your own numbers.

Targeting: keywords versus audiences

Google targeting is built on keywords and search terms. Your leverage is choosing the right terms, matching them to intent, and excluding the ones that waste money. Getting that foundation right is most of the work on search, and teams that run structured keyword research before they build campaigns waste far less budget on irrelevant clicks than teams that guess. The better your keyword and negative-keyword lists, the cheaper your real cost per customer gets.

Facebook targeting is built on people. You define interests, behaviors, and lookalike audiences seeded from your existing customers, and increasingly you hand the machine broad audiences and let its optimization find the buyers. The creative does much of the targeting work: a video that resonates with one type of person effectively selects that audience. This is why Facebook rewards a steady supply of fresh creative and punishes accounts that run the same three ads until they fatigue.

Measurement: where both platforms lie to you

Here is the trap that costs advertisers the most money, and it has nothing to do with which channel is better. Each platform reports the conversions it believes it caused, on its own attribution window, and both will claim the same sale. A customer who watched a Facebook ad on Monday, searched your brand on Google on Thursday, and bought is counted as a conversion by Facebook and by Google. Add the two reported revenue numbers together and you can easily overstate real revenue by 30 to 60 percent.

Act on those inflated numbers and you make the classic mistake: you scale both channels because both look profitable in their own dashboard, and your bank balance quietly disagrees. The platform-reported ROAS is not lying on purpose, it just cannot see the other channel or the money that actually landed in your account.

The fix is to judge both channels on the same reconciled basis. Blended ROAS takes total revenue from your store and billing and divides it by total spend across every channel, so no platform can double-count. Blended CAC does the same for customer acquisition cost. Our explainer on blended ROAS versus platform ROAS walks through the math and why the in-platform figure almost always overstates itself. Once you plan on the blended number, the Facebook-versus-Google debate stops being a war of two dashboards and becomes a single budget question: which channel earns the next dollar.

How to actually decide the split

Put Facebook and Google spend, results, and revenue in one view, on the same reconciled numbers, and the decision makes itself. You want to see each channel's spend next to the blended ROAS and blended CAC for the whole account, then watch what happens to the blend when you shift budget. If moving $5,000 from Facebook to Google lifts blended ROAS, the money follows. If it drops, you have your answer the other way.

That is difficult to do inside either platform, because neither can see the other and neither reconciles to your real revenue. A dedicated Facebook Ads dashboard and Google Ads dashboard that both feed one blended board solve it: MixedMetrics connects Meta and Google Ads read-only, adds TikTok, Shopify, and Stripe, and computes blended ROAS, blended CAC, and revenue by channel so the two platforms compete on the same fair number. If you want the underlying profitability metric first, start with blended ROAS and build the channel comparison on top of it.

The short version

Google Ads captures demand, Facebook Ads creates it, and both belong in most growth budgets. Do not pick based on cost per click, and never trust the ROAS each platform reports about itself. Run both, measure them on one blended view of real revenue, and let that single number decide how much each channel gets. The winner is almost never Facebook or Google. It is the account that stopped letting two dashboards argue and started planning on the truth.