They are fundamentally different DACs. It’s like comparing a BMW 6 series coupe to a Camaro ZL1. Any decision would rest on primarily whether one would be accepting of NOS's limitations, one's personal preferences, and synergies with the rest of the component chain. USB seems to limit the Morpheus' potential. The AES/EBU from a good transport or Pi2AES sounds better. More resolving, more lively, more real. Heck, I think Eitr to SPDIF, which has it's own limitations, is better than the built-in USB.