I have owned Nordost Heimdall 2, Frey 2 and Tyre 2 speaker cables and WW Silver 7 and Gold 7. I have never heard Cardas.
Generally speaking, the Nordost cables are incredibly fast but can be very much on the bright side so care should be given when matching them up to speakers. The Wireworld cables not do anything wrong and seem to pair up well with most any speakers I have heard.
I don’t own either brand anymore but I would consider WW a much safer bet if you had to make a decision without an in-home audition.
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Audio Room: CH Precision I1, Esoteric k01XD, Lab 12 Melto 2, Luxman PD-171A TT, Roon Nucleus, Stenheim Alumine Three, Silversmith Fidelium speaker cables, Siltech 680 interconnects, Shunyata Sigma USB Cable, Audioquest Hurricane PCs, Shunyata Everest,CORE Design racks, Stein Harmonizers, HRS damping plates, Stillpoints and all that other silly stuff.
Office: Luxman L-595A SE, Diapason Neos speakers, HiFi Rose RS150B, Nordost Frey 2 Interconnects, Tellurium Q Silver speaker cables,
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