Which type of cable sounds best for Streamer to DAC: AES/EBU or DIGITAL COAX or USB ??

In my setup, too, AES/EBU seems quite a bit better than USB.  I'm connecting an Auralic Aries streamer to a PS Audio Directstream DAC with modest cables (Curious for USB and DH Labs for AES/EBU).  I strongly suspect, though, that Jazzman7 is right.  It depends (on equipment, on cables, etc.).  The PS Audio DAC handles incoming data very differently than the Vega does.