- Jellyfin forced me to organize my files into Show/Season folders, whereas Plex just handled my original flat mess of scattered files.
- When playing video on Plex, I generally have to wait some time before subtitles show up, whereas the subtitles in Plex just show up immediately
- Plex has built in search for openly available subtitles matching your video that you can use if your video lacks subtitles (not sure if Jellyfin has it too)
That said, I still prefer Jellyfin for numerous other reasons, and I don't regret my migration.