Jellyfin has been on the upgrade list for a while. I think what keeps me on plex is the level of integration.
i.e. home assistant, works on all my devices etc.
As much as its a little older, I find it just kinda works and I haven't really found any reason to upgrade yet.
also bought the lifetime pass so I get a bunch of extra features.
The company has been pretty decent with new apps and features.
I.e. the plexamp is amazing. Full poweramp like interface and feature richness from a self hosted music library. Feels like better self hosted spotify