3 points
Biggest upside of Plex for me is the fact that you can set up secure streaming from anywhere with basically a single click. With Jellyfin, that is much more manual. Besides that, I think some people may like that Plex has its own set of TV Shows & movies to stream, though Iβm certain that those are ad supported. (Havenβt used that feature & have moved to Jellyfin)