It's a digital system. Speed of the photons/electrons isn't going to make it sound any different. Nor will noise, unless the noise is picked up and amplified by the analog section. Noise in the digital section (assuming it is well designed, and we wouldn't buy poorly designed stuff, right? Right?) will result in either nothing or a data error. THERE IS NO IN BETWEEN STATE IN A DIGITAl SYSTEM.
At one time I hoped the internet and folks day to day experience with digital data would make this more clear, but we live in a world where viruses can make a user jump through 3-5 hoops before activation and still spread. Sigh.
As Gonk points out, using optical has the advantage that there is no way that a grounding or other electrical problem might cause issues between equipment via a chunk of glass or plastic. Most important though, which inputs and are available on the back panel, that is, really, the key question.
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Charlie