I stopped using Plex almost immediately after installing it. I couldn't figure out how to proceed without creating a centralized account with them, which is the last thing I want or expect from a "self hosted" software package.
I think this is the worst part of Plex, it's self hosted but not really. Still depends on the company's continued existence. If the company goes bust my solution will probably just stop working. It took some time to set it up properly so the bloat is thoroughly swept under the rug, never in sight. This gives me a more than decent experience and the interface/UX is spot on for me.
The best of Jellyfin is that it's truly self hosted. But no matter how much set up I do, the experience is still never too good. I don't really like the UI/UX but I could get used to it. My biggest issue is how it handles the folder structure and metadata for series. They will always have to be neatly organized in folders to be properly picked up. You can't throw an episode file here, an episode in a folder there, the rest of the season in another folder and so on. They're just seen as independent material, no metadata. This makes the watching experience very stunted.
When I used it a few years ago it was still possible to use without an account if you knew the exact extremely-hidden-behind-dark-patterns steps, much like making a local account in Windows these days. But from the other comments in this thread I get the impression that even that tricky process is no longer an option.
