I have Gustard x30 and R30
I2S most pinpoint imaging, detailed but smallest soundstage and most analytical.
USB sounds better to me than I2S. Still detailed but bigger and fuller sound than I2S.
AES sounds the best in my system. Super smooooth. Most holographicfront to back.
if I was showing off my system to someone, I’d use USB. It’s very detailed and neutral. “Audiophiles” might find it “dry” or “sterile.” For listening hours on end, I prefer AES.

