2019 Shield Pro. Do NOT buy the tube model.
The Shield is the only off the shelf device that can bitstream TrueHD + Atmos & dts:X audio and also play 4K HDR video.
The tube model has problems with high bit rate 4K HDR video. Search the forum with “Shield tube” or similar terms to see the reports.
Plex for Windows and Plex Media Player do not output HDR video. They tonemap it to SDR. It does not matter which NUC you’re using. The limitation is in PfW & PMP.
Additional Information:
[INFO] Plex, 4k, transcoding, and you - aka the rules of 4k
