I have both RC and I really like both of them. It is hard to pic a favorite between the Res-C and the mudders. I haven't done any serious chopping though so maybe one of the other guys can speak to chopping comfort. I will say that the mudders conform to my hand better and would be easier for me to do more intricate work with. They are both excellent grips though. I'm glad to have both.
I think I would recommend std res-c on larger knives and mudders on smaller knives...
Hope that helps a little...I'm sure others will have more info. <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />