I have to say, Plex is a much more polished and more reliable piece of software in my experience.
I’ve used Plex for a couple of years and even got myself a lifetime premium pass when it was 65% reduced or something. But when news started popping up about them potentially leaking what content you watch i burned that bridge (look at the instance i come from, you can guess where my content stems from :D)
I then migrated over to jellyfin. It’s not as polished, it doesn’t run that reliable for me as plex did, hw accell, hdr convertion didn’t setup as easy but after a lot of tinkering it now works very fine for me.
I really enjoy jellyfin and the ecosystem that evolved around it.
No i am not talking about the player as hw accell and hdr conversion runs on the server itself
The server is not bulletproof and in my experience plex ran better for me than jellyfin.