It depends on the system. Most Bryston gear has a true balanced design, so AES/EBU should be best, but it's always good to have a listen for yourself.
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I'd try the AES connection. Try the Mogami Gold AES/EBU cable--I got one for about 43.00 from Musicians Friend. They have great Neutrik gold connectors, nice construction, very neutral, and are used by most recording studios as standard equipment. I found this sounds better as an interconnect between my BelCanto DAC3 and CD1 than a coax, which sounded really good too. But the balanced connection gives even more quiet background and image depth and detail.