Twonky doesn't mark stuff as watched, so you might forget which episodes you already watched are. Plex didn't work in linux, wouldn't read my external drive.
I'd still have to use Kodi for live TV, probably recorded TV too. That marks stuff as read I think though.
Looks like Kodi might be able to mark stuff as read, but you have to do it manually. Better then switching to Plex. I'm not a Plex fanboy.