Short answer
Google Ads captures demand that already exists: someone typed a query, so it is enough to stand in their way. Meta Ads first has to create that demand, because nobody asked for the ad. Hence two practical differences: the creative does the work, not the choice of keywords, and the order is attributed with a delay.
Running social profiles is editorial work, while this service is media buying: a budget, a media plan and responsibility for the cost per order. The question also comes back of which is better, SEO or advertising. Search engine optimisation gathers those who are already searching, while Meta Ads reaches those who do not yet know they need something. These two budgets stand side by side.
Two things in this work come from Meta's documentation, not from our opinion. Advertising policies decide what may be shown, and in sensitive categories they are what most often blocks an ad before anyone judges the creative. Server-side tracking, in turn, is a second, parallel source of events next to the pixel, so a campaign measured only by a script in the browser loses part of its purchases. That is why we implement it in the first month of working together. You can check what the Meta pixel sends from your site today in our free analytics scanner.
How soon do campaign results show? The first conclusions come two or three weeks after the start, once the learning phase is over, not after three days. We run Instagram from the same account as Facebook, because it is one advertising platform and one budget.