I actually run Plex, Emby, and Jellyfin. I would like to only run Jellyfin, but unfortunately some devices will not have jellyfin, but will have plex and/or emby. The main reason I personally still use Plex (or sometimes Emby) even though I am running Jellyfin with all the exact same stuff -- is because Jellyfin sucks at live TV / iptv. It's interface is complete trash and I can't seem to get a good "guide" going like I can with Plex or Emby. If that can be resolved then I'd definitely only ever use Jellyfin.
It's all automated for each one, and yeah they write the metadata into the folder. I have Radarr/Sonarr/Prowlarr + Ombi + rtorrent, which pretty much automates everything. I just type in what I want and it shows up in all 3 a minute or two later. Sonarr also keeps track of TV schedules, so if it's a new show that is still airing it automatically shows up when a torrent of it becomes available.
