What is this claim based on?AFAIK, I2S is regarded as the best SQ, followed by SPDIF coax and then AES. You may not hear a difference unless your system is highly resolving. I hear the most differences when I listen particularly to sound staging: width, depth and pin-point localization.
USB is capable for highest bitrates (up to DSD1024) and is the most ”hassle free” connection with galvanic isolation. I compared USB and i2s on my Spring 3 and USB sounded better to me. I2s can do up to DSD512 while all the other connections are clearly inferior.
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