The two platforms are not competing products. They do different jobs, and most of the argument about which is better is really an argument between two businesses that needed different things.
Search harvests demand that already exists. Somebody has decided they want the thing and is typing it in; you are competing for a customer who has already made the hard decision. Social creates demand that did not exist thirty seconds earlier. Nobody opened the app to buy your product, and your ad has to do the work of making them want it before it can ask for anything.
That difference decides nearly everything: what the creative has to do, how patient you have to be, and which one you should switch on first.
The question that actually answers it
Is anyone searching for what you sell?
For a product in an established category — running shoes, office chairs, dog food — the answer is obviously yes, thousands of times a day, and there is a queue of people with their wallets out. Start with search. The demand is already there and you are choosing whether to appear in front of it.
For a product that solves a problem people do not know has a solution, or a category that does not have a name yet, nobody is searching because nobody knows what to type. Search will spend your money on a handful of tangential queries and report that ecommerce advertising does not work for you. Start with social, where you can put the product in front of a description of the person rather than waiting for them to name it.
Most stores are somewhere between, which is a real answer rather than a dodge: there is search volume, it is smaller than you would like, and social is where the growth is. The order still matters, and it is almost always capture first, because a campaign that converts profitably from day one funds the experimentation that the other one requires.
What each platform demands from you
Search demands a product feed and patience with the boring parts. Titles, images, availability and pricing in the feed do more for shopping performance than bid strategy does, and feed work is genuinely dull, which is why it is so often where the opportunity is still sitting.
Social demands creative, continuously. This is the part that surprises people who come from search. Targeting is largely delegated to the algorithm now; what you control is what it has to show, and that supply has to keep coming. Campaigns do not usually stall because a setting was wrong. They stall because the creative pipeline stalled, and the symptom is a steadily rising cost per result on a campaign nobody has touched.
Budget the creative before you budget the spend. An arrangement that includes media management but no creative production will run out of road in about six weeks, and the report will blame the audience.
Attribution: why both platforms will claim the same sale
Add up what each platform reports and you will find you sold more than you did. Both are telling the truth as they see it, and both see a version where they were involved.
This matters most for the campaign types that optimise towards people who were going to buy anyway. Brand search and broad automated campaigns are both very good at taking credit for customers who already knew your name, which makes the dashboard look excellent while the business feels unchanged.
The defence is simple and almost nobody does it: watch total revenue and total spend against each other, and separate branded from non-branded. If a campaign's reported return is superb but total sales did not move, you are paying to reach people who were already yours. That is worth knowing before you scale it, not after.
Where the sequencing usually lands
If demand exists, start with search, make it profitable, then add social to grow the pool of people who know you exist. The social campaigns will look worse on last-click reporting and will still be the reason search volume grows.
If demand does not exist, start with social to create it, and expect to spend money learning which message works before anything is efficient. Then watch search: when people start typing your brand and category, capture it, because that is the demand you paid to create and it would be careless to let a competitor harvest it.
Either way, do not run both badly at once with a budget that cannot reach a readable result on either. Thirty conversions is roughly where numbers stop being noise. Split too thin and you will have two campaigns and no information.
A note on who should run them
The single largest avoidable cost in paid media is the gap between the ad and the page it lands on. An agency that runs the campaign but cannot change the landing page is optimising one half of a system, and it is the less important half.
That is the honest reason we run both sides of this ourselves, and it is also the thing to look for in anyone else you hire: not which platform they prefer, but whether they can fix the page when the traffic arrives and does not convert. The account-level detail of how we run each is on the search side and the social side, and both start with a free teardown of the account you already have.
