The platform is catered to projects.
You can browse for projects on Itch. You can only search for creators on patreon.
You pay for a project and become an owner of your keypage to the project on Itch. On patreon you pay the creator for temporary access to whatever support-tier they have - you will not own a copy of the finished game, even if the final game only costs 10 bucks and you supported it with 400 bucks over the years.
Whatever people use a platform's payment method might not be the intended way. Patreon is very ill fitting to finance projects like games. It is ok to collect regular donations and give some incentives, like giving access to a more recent game version. I have even seen projects that outright suggest to "buy" the game by supporting for a month on patreon - because money collection is hard for small time devs. They use whatever they can.
Oh, and my impression of the devs on patreon with multiple games, was more like, give us money because you like us and also, you will have access to the non-public version of our games. But there is very likely perception bias, because so many devs only have one game in the making.
Anyways, Itch should fill the nieche between kickstarter and patreon. Financing a game project while it is being made, having "early access" for that period, and still getting the completed game in their library. There is no library on patreon where you can download your games.
