Jellyfin is a fork of emby from the time when emby went closed source. They are very similar, emby has a similar thing to Plex pass (emby premiere) to monetize for extra features, but it's not enshittified (yet, maybe - who knows).
I'm not sure if it's available without premiere but it has the intro detection and skip feature, which is one of the main things I miss from jellyfin. I also prefer the app on android TV for some small reasons (over jellyfin). I'm not sure if it's overall better, especially if you hadn't already paid for it - I got a lifetime pass on it for cheap once.