Difference in sound between copper and silver digital cables?

You asked simple question and got elaborates in the answer. Shortly: there is a difference. Shortly: unable to specify which is better because it is subjective. You have to listen. After all... you will find the differences even in the same DAC input types (AESEBU, COAX, fiber, USB).
The cabe is not just the conduit but also the filter. Some cables are better than the same with different length.
If you are audiophile don’t listen the fellows with bit is a bit approach. Let them focus on their consoles and best games. Use your ear instead. If you do not feel satisfaction from the item don’t buy it :)
Is this you or your guests you build your application for?

+1 on the Audio Envy digital cable.

I have tried a number of high end digital cables including ones made from silver and prefer those by Sablon, which are made from copper. Some of the cables I have tried are three times the price of the Sablon cables.

Another recommendation for Audio Envy digital cable.

audiozenology"People will perceive differences and then try to assign them to something they understand even though they have no idea why the difference (or even with certainty that there is). That may sound harsh, but true."

This is true and has been true since the very earliest stages of man’s existence however it is also true that people who fail to perceive something will sometimes then try to assign a reason for that that they understand even though they have no idea why they can’t perceive it. That may sound harsh, but true.