As I understand it, digital coaxial cables are 75 ohm and digital AES/EBU (XLR connectors) cables are 110 ohm. That said, I have used half an analog pair cable in place of a digital cable at times and it can work fine. Whether the digital coax or the analog sounds better in your system will be for you to decide. I use the AES/EBU and it sounds best to me.
