I've been using a Pi 3B+ for the past year or so to run my Prusa MK3S/MMU2S and haven't had any show-stopping issues related to the Octoprint side (don't get me started on the MMU side...)
I recently bought a pair of Pi 4s for two other projects, but figured out I could do both projects with one. Now I have a spare, and was wondering if there are any good reasons to upgrade the Octoprint Pi from a 3 to a 4? I'm hardwired with ethernet, so wouldn't see any improvements with WiFi/USB, I imagine. Using Enclosure plugin to manage temperature and lights through a relay HAT, and I'm using an official Pi camera board.
Am not interested in working through Pi 4 teething pains.
I'm thinking don't upgrade; change my mind.