I own the Aurender N20 Music Server with BOTH USB and AES/EBU digital outputs to my MSB Premier DAC. In all cases, I prefer the AEB/EBU connection. Based on all cases, when switching back and forth between USB and AES/EBU, I always found the AES/EBU connection to be the most musical.
My Aurender connects to my DAC using the Shunyata Omega AES/EBU Digital 1.5 meter cable.