Never used plex but heavily looked into both plex and emby way back and came to the conclusion emby was what i wanted mostly due to it having an add on for Kodi that plex didnt. Funny enough plex released that same thing within the year and i was like oh well. Looking back on it all now I still love my decision even more. I paid for the lifetime sub which was $100 i think? Thats now under $1 a month and I don’t see it going away anytime soon. I tried out jellyfin a few years ago for a 2nd media center and an excuse to try it out, I honestly didnt think it was very good and was shocked that everyone loves it so much. I even had issues playing some files which i never had problems with before on emby.