Hm. As a disclaimer, I've never setup a Plex instance or used one, but from what I've heard, it seems to be very stable.
I think the Jellyfin UI is easily understandable for users, but what you might have to be prepared for is supporting them with technical issues. Jellyfin has apps for Android[-TV], iOS, webOS, Windows and probably more. I gave my dad access to Jellyfin and he had some issues with it related to Chromecast and his TV. On my end I can't use the Android app because I run into audio issues (could be my fault).
Jellyfin is awesome when it works and I really love it, but I've had to dive into the logs quite a few times. Sometimes it was my fault, but other times it's noticeable that Jellyfin is a smaller OSS. Stuff breaks, especially edge cases.
AFAIK you can just install Jellyfin and point it to the same libraries which your Plex uses. That way you can test it for yourself without bothering the people who use Plex. It might add some pictures, but the rest will be fine.
I think if you already have a Plex setup which works and you're happy with, I'd stick with that. I chose Jellyfin because Plex seemed too commercialized to me and I heard some things about it I didn't really like. But most people I know use Plex over Jellyfin, the only people who use Jellyfin are the ones who I managed to convince to use it :)
I think the Jellyfin UI is easily understandable for users, but what you might have to be prepared for is supporting them with technical issues. Jellyfin has apps for Android[-TV], iOS, webOS, Windows and probably more. I gave my dad access to Jellyfin and he had some issues with it related to Chromecast and his TV. On my end I can't use the Android app because I run into audio issues (could be my fault).
Jellyfin is awesome when it works and I really love it, but I've had to dive into the logs quite a few times. Sometimes it was my fault, but other times it's noticeable that Jellyfin is a smaller OSS. Stuff breaks, especially edge cases.
AFAIK you can just install Jellyfin and point it to the same libraries which your Plex uses. That way you can test it for yourself without bothering the people who use Plex. It might add some pictures, but the rest will be fine.
I think if you already have a Plex setup which works and you're happy with, I'd stick with that. I chose Jellyfin because Plex seemed too commercialized to me and I heard some things about it I didn't really like. But most people I know use Plex over Jellyfin, the only people who use Jellyfin are the ones who I managed to convince to use it :)