The BEST KODI box at the moment? (4K, HDR, HD Audio, TV Upscale)

Hey guys,

I read through the choose KODI Box thread, that @wrxtasy did a great job on. However I just could not comprehend all the information. I am sorry for this, and hope you guys can help me get it straight. I already bought a ton of different hardware by now I feel like, and I still haven’t had anything reliable going for me yet. I own: NVIDIA Shield (Old version 16 GB), Intel NUC (NUC7i5BNH – Kaby Lake), Raspberry Pi 3, Amazon Fire TV Stick Gen 2. Also I own a Synology DS216play NAS.

I want to get my setup straight, and I am ready to replace anything that is not perfect. I had so much trouble, especially with the resolution switching on my NVIDIA Shield that I decided to ditch it and get an Intel NUC, that I thought would solve everything. However, the NUC is just not playing nice with me, and the HDMI issues are seemingly never going to end.

I need:
-Auto switching resolution between 720p, 1080p and 2160p, to let my UHD TV do any and all upscaling
-Auto refresh rate changing – 60 Hz GUI and 23,976(I believe is the correct number?) for videos
-Bitstream all kinds of audio, including object based (Atmos, DTS:X)
-HDR
-Optimal picture quality in all aspects
-Something capable of being buttery smooth in the GUI with the more graphical themes
-Be controlled with my Logitech Harmony Elite remote

I don’t need online streaming channels like Netflix, Amazon etc. – I got those on my TV, which is fine with me! I only need my KODI box to handle “local”(from my NAS) content perfectly.

Hit me with your best shot!