That is easy, it depends. On your system and values. To my tastes and system the Cardas are a touch too warm, and the Nordost are a touch on the cool side of neutral and lack bass.. I am not that familiar with the other.
I have owned a number of Cardas and have always found them on the warm side of neutral, loosing some high end details, or at least putting it in the background. I have auditioned some Nordost Frey 2… they did not work well at all with my equipment too harsh. I feel that Transparent cables and interconnects in all my systems have been neutral… with my current components a very good thing… something that was not a good thing when I had much lower level components.
I have owned a number of Cardas and have always found them on the warm side of neutral, loosing some high end details, or at least putting it in the background. I have auditioned some Nordost Frey 2… they did not work well at all with my equipment too harsh. I feel that Transparent cables and interconnects in all my systems have been neutral… with my current components a very good thing… something that was not a good thing when I had much lower level components.