I used a V-Link between my iMac and a DAC that didn't have optical input so that I could use the coax input on the DAC. That worked well and sounded better than the USB option but I eventually replaced the DAC with one with optical input and no longer needed the V-Link.
The optical to optical sound is better than the previous setup but that's most likely because it's a better DAC. The V-Link works really well if you need it but in your case I doubt there's any advantage to having one.
The optical to optical sound is better than the previous setup but that's most likely because it's a better DAC. The V-Link works really well if you need it but in your case I doubt there's any advantage to having one.