I use Plex and have the 'lifetime' licence.
There have been bugs that don't get fixed for years, while a bunch of new features I dont use keep getting released.

These are incredibly infuriating; downloads, server not connecting until app reset, library browsing glitches that only get worse each year...

I have not switched to Jellyfin yet due to my specific setup, but it will happen, or I'll go mad, whichever comes first.

I use Kodi with the Titan Bingie Mod v2 installed as the front end skin. It looks and controls exactly like Netflix, which isn't a great streaming service anymore, but their UI is probably the best and most familiar. Only trouble I have is that I can't connect to my server via VPN, only a rawdog connection, but it's my home network so I'm not super worried.

Plex has a lot of issues but that criticism I do not get: they have one payment tier. If you pay, no features are held back.

The only exception I can remember is when they had that stupid arcade game feature, which was a separate monthly fee. It's long dead now.