It probably doesn't matter at all. You likely won't be able to tell the difference. I have had optical connections that I thought were inferior but I didn't have any incentive to figure it out, I just switched to USB and was happy. Most roon users, including me, use USB. There is some anti-usb rhetoric out there. I don't believe it but some do. Either way, given the level of equipment in your system, you shouldn't be affected by it.
Jerry