I use both these pads at the moment (front rock, rear belaey), the Rockpads have a really good wear life, good bite sound and hold, but they don't preform all that well in dusty conditions. Whereas the Belaeys have a worse wear life, around the same bite and hold (maybe slightly better but not much at all) and preform better in dusty conditions, both pads work well in the wet.
So honesty i would go for Rockpads as they are cheaper, last longer for basically the same performance.