Wow, these are all such great responses. I wrote a post a while back for the blog in case anyone is still on the fence or thinking about switching their campaign from monthly to per-creation or vice versa: https://blog.patreon.com/should-your-page-be-monthly-or-per-creation/ – it has some data about which categories tend to go which way, and also some info about post frequency for each campaign type.
Hopefully you find it helpful!