Since you have both why not try yourself and decide which suits your system best.
Cardas Clear Light or Mogami 2549 XLR
The setup I'm putting together is XLR from an Ayre KX-5/20 preamp through a Marchand balanced passive high-pass crossover to an Ayre VX-5/20 amp. The impedance of the crossover is 1K Ω. I have the Cardas and Mogami cables. Either preferred? I've previously used 3' Cardas between the preamp and amp, but these are 7' cables.