Aurender streamer upgrade

I'm in the position to upgrade my streamer.  Need recommendations for my system. 
I have Mcintosh MC452 with C2600,  MCD550,  Sonus Faber Elipsa and blue sound node 2. 
I also have second system which I could use with a new streamer, Mastersound 845 integrated amp with Diapason speakers. 
I've been looking at streamers and have narrowed down to the following

1. Aurender A100
2. NAD M10
3. Aurender N100h

I know that A100 has a build it DAC but it also has a USB out if I wanted to use my C2600. But I could also use it with analog out to my integrated. 
1. Would the A100 have at least the same quality digital out as N100h? Is it better or worse? 
2. What is your experience with A100? what are its characteristics? 
3. What about NAD M10? How does it compare to A100.
4. How good is the AKM DAC in Aurender? 
5.  Which has a better interface? 
6. Which would work better in my systems?