This is a very component dependent comparison. I had the accuphase seperates and they sounded best with the AT&T/ST glass cable, but that's how they were designed to be used. Different components will perform differently with various digital cable connections depending what the designer felt was a superior cable design. The only sure way to find out what's best is of course listen to them both, and see which one you like better. Like Glen said AT&T cables never really caught on in the audiophile world, so not many companies tried them and even fewer are using them today.
AT&T ST glass vs. AES/EBU connection
Just wondering how the fellow "goners" feel about the reproduction qualities between these 2 formats. In particular, I am comparing the Kimber 1/2m orchid balanced interconnect against a Seicor ST glass fiber optic cord. These are being utilized between a Genesis Time Lense and a Timbre DAC. The manuals say that the greatest bandwidth is realized with the ST glass connection, but I was wondering if and how the supposedly additional 2 volts provided by the balanced connection would affect the sound.