+1 Erik. My experience (after 50 yrs of this) is also that "room acoustics are 100x a better investment than cable swapping."
Cables make small differences that may or may not suit your specific setup. An equal investment in room acoustics is almost guaranteed to improve the sound -- unquestionably and markedly -- compared to an untreated room. Even a few hours spent moving speakers and listener, preferably with a measurement mic as well as ears, can pay great dividends.
But to answer the question: when I've tried them (a long time ago), Cardas cables tended towards a smooth sound. The one time I tried WW was recently, and when using a 25' balanced interconnect, I thought they did something odd to the high frequencies.