Tbh I liked Plex when I used it years ago, then I stopped using it as I went full on Netflix/Amazon Prime out of sheer laziness. Having now come back to self-hosting and acquiring media myself, I went with Jellyfin mostly because it’s FOSS and it does everything I need it to. I noticed Plex has some features locked behind a subscription which I don’t like the idea of, and iirc there were some privacy issues at some point? So those things made me hesitant to give Plex another go.
Also, I had used a friend’s Jellyfin before hosting it myself and I was really impressed with how well it worked on my devices, whereas when I used to use Plex I’d see stuttering/buffering issues from time to time, especially if watching a foreign film for example and the subtitles wouldn’t load/render from the .srt file properly.
As for apps… my TV runs Android and the Jellyfin app on that works great, and no problems with the iPad app either. I can’t speak for consoles though as I don’t use mine any more so have no idea what the JF app is like on those.