These two get treated as the same purchase with different price tags, and they are not the same purchase at all. One buys you an object. The other buys you a moment.
I sit on the UGC side of it, so I have a view. Plenty of campaigns want both, though, and the expensive mistake is not choosing wrong. It is briefing one and paying for the other.
What you own at the end
Start here, because everything else follows from it.
When you hire me, what you get is files. Edited video, raw footage, hook variants: assets that live in your library, go into your ad account, and can be spent behind for as long as your licence runs. Nobody needs to see them for them to have value. They sit there being usable.
When you hire an influencer, what you get is a post on their profile, in front of their audience, at a moment in time. The value is the exposure event. The asset is incidental, and frequently you do not have the right to reuse it at all without a separate conversation.
An object you keep versus an event that happens. Nearly every difference between these two comes out of that one.
What each one is good at
UGC is good when you need volume, control and repeatability. You want fifteen assets to test, you want the messaging to say a specific thing, you want to run the winner for six months. That is a production job and it is priced like one.
Influencer is good when you need borrowed trust at a specific moment. A launch, a moment of cultural relevance, entry into a community that already listens to someone. You are renting a relationship you have not built, which is a real thing to buy and cannot be manufactured by shooting more videos.
The failure mode in each direction is fairly predictable. Brands buy influencer posts hoping for a content library and end up with three posts they cannot reuse. Or they buy UGC hoping for reach and are disappointed that nothing happened. Nothing was supposed to happen: they bought files, and files do nothing until you put money behind them.
The follower question, and why it keeps confusing this
Follower count is usually the first thing a brand asks a creator about, and it is the natural question if the two things look like the same product.
For the work I do, it is close to irrelevant. You are not renting my audience. You are commissioning footage that runs under your name, and my reach has no bearing on whether that footage converts a stranger who has never heard of either of us.
The one exception is real and worth naming: if you want the content posted from my handle as well as yours, that is whitelisting, and it is a hybrid of the two models. Ad from a person rather than a brand, with the creator's social proof carried over. It is priced separately because it is a separate thing, and it is the honest middle ground when someone cannot decide.
What it costs, roughly, and why they are hard to compare
You cannot put these side by side on price, because the units are different.
UGC is priced per deliverable and per licence: you are buying production and permissions, and what sits inside that number is its own subject. Influencer is priced per post against audience size and engagement, which means you are partly paying for reach you may or may not be able to measure.
Where brands get caught is comparing a per-video UGC rate against a per-post influencer rate as though they buy the same outcome. Fifteen UGC videos and one influencer post can cost the same and do entirely different things, and neither is overpriced. They are answers to different questions.
How to tell which one you need
One question, and it separates them cleanly: if nobody saw this except your ad account, would it still have been worth buying?
If yes, you want UGC. You need assets and you will supply the distribution yourself.
If no, because the entire point is that a particular group of people see a particular person holding your product, you want influencer, and you should stop evaluating creators on production quality, because that is not what you are buying.
If you want both, buy both, but brief them separately. The expensive waste here is a brand paying influencer rates for someone who is being asked to produce ad creative, then being unhappy with footage that was never made for that. Deciding this first also shortens the search, which is a cost in its own right: a shortlist built for the wrong object is a shortlist you throw away.
Where I sit, plainly
I am the first one. I make assets, and I write, shoot, voice and edit them myself, which is how a brief turns into finished files in three to seven days, and why they arrive ready for your buyer rather than needing another pair of hands between my delivery and your ad account.
If the answer to the question above is no, I am not the right booking, and I will say so in my first reply rather than sell you files you did not want. If it is yes, send the product, the number of videos and where they will run, and book the first batch as a test rather than a finished campaign. The second batch is where this model pays: same product, same buyer, and the briefing is a message instead of a document.
Common Questions
What is the actual difference between UGC and influencer marketing?
What you own at the end. UGC buys you files: edited video and raw footage that live in your library and can be spent behind for as long as your licence runs, whether or not anyone ever saw them organically. Influencer marketing buys a post on someone else's profile in front of their audience at a moment in time; the exposure is the product and you often cannot reuse the asset without a separate agreement.
Does a UGC creator's follower count matter?
Barely, because you are not renting their audience. The footage runs under your name. The one exception is whitelisting, where the content is also posted from the creator's handle, which is a hybrid of the two models and is priced separately.
How do I decide which one I need?
Ask whether the work would still have been worth buying if nobody saw it except your ad account. If yes, you want UGC and you will supply distribution yourself. If the whole point is that a particular audience sees a particular person with your product, you want influencer, and production quality is no longer the thing to evaluate.
Can I compare them on price?
Not directly, because the units differ. UGC is priced per deliverable plus licence; influencer is priced per post against audience size. Fifteen UGC videos and one influencer post can cost the same and do completely different things, and neither is overpriced; they answer different questions.