@ctlesq - I own a Denafrips Ares II and Black Ice Glass Tube FX DACs. When I originally purchased the Denafrips DAC I chose it over the Black Ice DAC primarily based on the purchase price and the fact that the Ares II doesn’t have the headphone amp capability that is a wasted function for me. Eventually, curiosity got the best of me so I purchased one of the very last Black Ice DACs (after they listed them as not available). I started with the upgraded Psvane tubes that I was told were essentially a copy of an Amperex tube I have since upgraded the tubes and now have NOS Amperex Holland tubes that are identical to the famous Bugle Boy tubes with different labeling. They improved the sound to my ear as it was a bit too warm for my system.
I would consider the two DACs to be equals from an overall sound quality perspective, but they do sound different making it a personal preference. The Denafrips seemed to have a blacker background (less noise) which I miss at times. The Black Ice has a more 3D soundstage. It’s a bit of an apples to oranges comparison because I also changed tubes in my Pathos Classic One MKiii amplifier as part of the change. I had been using 1960s Mullard Great Britain tubes, but got a set of NOS 1960s Mullard Great Britain gold pin tubes. The gold pins resulted in a dreamy sound, but it was a bit too warm for my taste. Part of my motivation for trying a different DAC was to see if I could find the right balance with the gold pin tubes. It took the NOS Amperex tubes in the DAC to bring it all together. I plan to keep the Denafrips DAC for the future as I anticipate that at some point I won’t be able to get the tubes needed to keep me happy.

