https://github.com/jeppevinkel/jellyfin-tizen-builds -- No way around having to enable developer mode for Samsung TVs, sadly, but they do have a client.

Jellyfin also does Music and Ebooks. -- I don't know how well it does this though, as I don't have Jellyfin manage my music, I just use Pandora because I'm too lazy to curate 'stations' and make track lists and stuff.

That's more on the featureset that's available without having to rent it from Emby. Hardware Transcoding, DVR, Live TV, Cinema Intros, Automatic Metadata, Offline Files, that kind of thing.

I think Jellyfin is lacking an Xbox client, maybe a WebOS client, and I run Jellyfin behind a reverse proxy with Caddy for automatic SSL, so it's best to run it behind a subdomain imho. I wildcard my subdomain so that it doesn't show up in publicly available SSL certs. One of the big downsides (I'm not going to lie to you here) is that there is no central login authority, so you can't get to your instance 'blindly' like you can on Plex. (where Plex kind of proxies your traffic to your instance) - but that's a plus to me, because I don't want someone MITM-ing my collection.