I used both brands and both cables you mentioned in my system before. As thyname said, TWL Obsession and Cullen Crossover II are not in the same price range so it’s not really an apple to apple comparison. I personally prefer TWL power cords and I’d suggest you to give their 7 Plus or Digital American HP a try. These 2 power cords sound good to my ears and they’re in the $400 price range (used).
