What makes a Digital Interconnect

I posed my OP to the manufacturer. Here's the response edited to anonymise, the cable in the OP is X:

"The X is an excellent digital cable, the Y is the digital version, and essentially just has more shielding. Both are 75 Ohm cables, with killer bandwidth and excellent group delay. If you are using X [instead of] Y, I would save your cash, spend it on music instead. "

Here are the specs on the dedicated digital cable "Y":

3.3’(1.0m) [RCA > RCA]
Geometry: coax
Bandwidth: > DC - 1 GHz | Linear Phase
Cp: 65 pF (pin / ground)
Ls: center pin 2.6 μH
ground 0.5 μH
Bend Radius: 3.5” (90mm)
Cable Diameter: 0.35” (4.8mm)
Shielding: Shielding shunted to ground at both ends of cable

Thanks Al,

For me, choosing an audio vendor is 50% quality and 50% service. I'm demoing a few cables by this company and I can say without a doubt that for 4-5 years there has been no better service oriented company.

If you don't like it, they take it back. In one case, I didn't like the cable and let the service rep -- the owner -- know. He sent me a new cable not yet released to the public and 3x the cost of the one I originally purchased. All he asked was that I give him feedback.

A good company is hard to find. These guys really strive to make you happy.

I'll give cable Z a try.

Best,
K