Recommendation for Digital Coax

I think the key test for optical is does 100% of data pass thru or not.

Same goes with coax, except that coax potentially could pick up rf noise whereas optical cannot.  That's why optical is the most used method to transfer data from one continent to another, around the world.

The reason why we have HDMI instead of optical is cost of implementation, because yes you need a set of converters.

For CD, up to 24/96, optical is my choice, because it really does decouple transport and DAC.  Mono POF preferably since there's only two light waves.

When in doubt I go Mogami whenever I can.

2nd vote for the "Pangea Audio Premier XL Digital Cable with Cardas Copper" sold by Audio Advisor.  Currently $169 for 2m.

I've tried a number of coax cables in this price range and liked this one the best.  I had to spend quite a bit more to better it in my system.

DH Labs D750 simply the best sounding coax I've heard, I've owned the D60 and yes it's a phenomenal cable but when it comes to musicality which is hard to do in the digital realm by nature the D750 is balanced from top to bottom  showcasing layer upon layers.

DH Labs produce good quality, cost effective interconnects. I have used them off and on for more than  twenty years on various systems I have been creating.