My experience with Jellyfin have not been great. The mobile app is just not working well enough
Plex has lots of customisation available (which I prefer) but is a little harder to get running in my experience. I’d say, install them both and see what you like most. Do start with Jellyfin as it’s easy to install.
Been quite a while! Thanks for telling me though, I will test it out when I get to it!