I’ve got Jellyfin up and running right now on a DS620Slim NAS and it’s running pretty good so far. I’ve seen a lot of people say they prefer Plex over Jellyfin. What are the main advantages to plex?
However I switched to jellyfin a few years ago because I found everything to be too limiting and dependent on them. Including the necessity to pay for codecs / playback on some of their mobile apps.
Jellyfin is a lot less polished, but it works well and you're in control of everything.
I would recommend trying out jellyfin first. If you encounter some deal breaking issue or aren't happy with it, check our plex.