Power cords - Cabledyne vs Signal Cable

Power cords do make a difference ... a big difference. Has anyone compared the two companies listed? Both receive good comments here on Agon. I have compared the two Signal Cable power cords and prefer the more expensive version with silver ($169). But I have no experience with Cabledyne which is a bit more expensive. Their Silver Reference cable ($250) received a glowing review from Mono&Stereo.com and they have a Silver Premier ($325). Anyone compare the two companies?