Here’s why I still use Plex: for me Jellyfin hasn’t been easy to work the way I want it to. I mostly access my media on an Nvidia Shield, and the Jellyfin Android TV app just refuses to play certain videos; I can play them if I use VLC as an external player, but not within the app itself. The more pressing issue is that Jellyfin just refuses to play 5.1 audio, and downmixes everything to stereo. I have other issues, but these are the ones that prevent me from using it.

For me Plex just works.