I've used both and settled on the Cardas. IMO, the Cardas is a little smoother and more musical and the AQ is a little more incisive and dynamic at the fringes. Like everything else, though, YMMV.
Cardas Clear or AudioQuest Carbon USB cable
I'm using a short Cardas Clear USB cable from a Mac Mini to an Ayre QB-DSD DAC for Roon, The DAC displays bit rates up to 192. Would an Audioquest Carbon cable be better?