Just jumping in to add that what has kept me on emby is the guide data for live tv available with a subscription or lifetime license. I like it and haven't had too much trouble, although currently emby theater for Linux has a UI bug they are still trying to work out.
I have 4k monitors and wish I went 1440 instead. 4k is good for big TVs, but for PC monitors the visual difference was negligible. 60 to 144hz is very noticeable however.