Cables are very subjective. If you read through the 2 latest threads on these 2 brands, both mention the other and there is a lot of comparing and contrasting.
For my system, I found the High Fidelity speaker cables and rca's work the best (highest level) whereas the balanced Hi Diamond and power cords work the best (also highest level). I get better sound out of the High Fidelity rca's than the Hi Diamond 3 XLRs. The difference is greatest at the highest level in my system - its not even close. Characteristics such as speed, openness, clarity, micro and macro details and a "you are there" palpability are important to me and that is where the High Fidelity's excel. Just my opinion.