I moved from the N10 to the N20 and couldn’t be happier. IMO a big upgrade-better dynamics and quieter background. I also switched back and forth between the usb, BNC, and AES multiple times. At the end of the day the BNC and AES were almost identical and both superior to the USB in my system(feeding a Chord DAVE). Love the conductor app too.
Overall I think you would be very happy with the N20. Good luck!