Emby has a native Samsung Tizen app and Jellyfin doesn't. That's a bit of a dealbreaker for me.
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Edit: also, last I checked, Tizen still has no Twitch app, which is a bigger problem since Twitch had Samsung remove the unofficial one. I don't really like Twitch much, but still. YouTube's Android app is also better than it's Tizen app, even on low-end Android TV sticks.
I've been running it for a while now and it's actually pretty good, I haven't had any major issues except one freeze when searching, but I'm pretty sure that was the fault of the raspberry pi running jellyfin
It requires some terminal stuff, but only for installation.