Jellyfin doesn't rely on a third party server to function, but Plex often runs into fatal issues because of it. There have been times that my whole server became completely unusable because it couldn't configure itself properly to plex's servers or didn't have an internet connection. Jellyfin is fully self hosted and doesn't have any of those issues, which I like a lot better. And it was an easy replacement. 

 Thanks. That's good to know. I use Jellyfin because my wife always said, "I wish Netflix had a random button."

She wanted to click a button that would play a random episode of Friends.

Jellyfin fixes this. 🤣 

 Been using Jellyfin for probably 8-10yrs and it's been nothing short of fantastic. 
And out of the the shows and movies we have, the wife only watches Friends. Every. Day. 🤣🙄 

 SAME WITH MY WIFE! 🤣 She puts a random episode of friends on when we go to bed every night.