Requesto for a hint: the best hardware to run plex player

Hello!
I’ve my server running on a qnap and up to now my player is a quite old mac mini.
I’d like to upgrade, mostly to have 4k and 7.1
I was thinking to buy the new appletv. Is it a good idea or is ti better to buy a different device to run the player?
BTW I’ve also a xbox connected to the same network, just I never considered it as a valid player
Thank you you all for any suggestion!!

wow replay nobody can give me a hint? :o :o :o

The nVidia Shield is currently the most able Plex client.
Only trumped by a fully blown PC.