Personally I prefer the NuPrime.
I like the detail it has.
Especially using headphones it really shines.
It has no problem driving my Audio Technica ATH A900X’s
Add to that the fact that it also does DSD makes it a winner to me.
I just have not been able to figure out why the side entry for the USB.
As for the U7 it has nothing that stood out in any way.