This is the question I get most often, and the honest answer is that it's the wrong question. Google Ads and Facebook (Meta) Ads reach people at different moments. The right choice depends on how your customers buy, not on which platform has the cheaper click.
Start with how people buy
Someone typing “dermatologist in Maadi” into Google has a problem now and is comparing options. Someone scrolling Instagram is not looking for anything; an ad has to interrupt them and create the interest. Both can produce leads, but they are different jobs with different economics.
Search captures demand that already exists. Social creates demand and then brings people back. That single distinction explains most of what follows.
When Google Ads wins
The trade-off is cost and ceiling. Search clicks in competitive niches are expensive, and once you have captured the existing searches there is nowhere else to scale.
- People already search for what you sell: clinics, lawyers, contractors, repair services, B2B software, courses with a known name.
- The purchase is urgent or high-consideration, so the buyer wants to compare now.
- You sell locally and searches include a location.
- You need lead quality more than lead volume: a searcher who described their own problem is usually closer to buying.
When Meta Ads wins
The trade-off is lead quality. Instant forms in particular produce leads that are cheap and often unqualified. Without a qualification step and a fast follow-up, the cost per real customer can end up higher than search.
- The product is new, visual or impulse-driven and nobody searches for it yet.
- You want cheap reach to a defined audience and can afford to educate them.
- You already have traffic and want to retarget visitors who didn't convert.
- Your creative is strong; on Meta the creative is the targeting.
The mistake of choosing one forever
Most lead-generation businesses end up with both, in a specific order. Google captures the people who are already looking. Meta retargets everyone who visited and didn't convert, and later expands to look-alike audiences once there is enough conversion data to learn from.
Start where the intent is strongest for your business. If searches exist, that is Google. If they don't, Meta is the only way to create them. Add the second platform once the first has clean tracking and a stable cost per lead.
What to measure before deciding
Compare cost per qualified lead, not cost per lead. A platform that produces leads at half the cost but a quarter of the quality is the expensive one. That requires two things before the test starts: conversion tracking that counts real actions (form submissions, WhatsApp clicks, calls), and a way for the sales side to mark which leads were real.
Give each platform four weeks and enough budget to reach a few dozen leads. Judge the result on qualified leads and on what happened after the lead, not on the platform's own dashboard.