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.