Hi Lee
I've been reading up on these systems too recently, though I have yet to road test any. You seem to have found the two streamers I've identified and I can't see any obvious direct competitor (price and function).
The Uniti Star has a built in CD player. The Atom seems the closer competitor to the M10.
The Atom has been really positively reviewed. It has TIDAL but I don't see the ability to decode MQA on the spec sheet (I may have missed it).
The NAD uses BluOS, which apparently confers the ability to play Amazon Music. This might be significant in a future decision as I suspect we may see some rationalisation of streaming services (this is just my speculation).
For 」500 less NAD also has the Classic 658 streamer - a less sexy box with no screen or amp.
Simon
MINI DSP SHD; Longdog 300b; Reiver Fenwicks
Twitter @siashmore