I have the M7, haven't had the chance to do anything with them besides try them on. They fit well, quality seems to be great based on visual inspection. They're fairly noisy out of the box and I'm hoping they quiet down with use and a few washes. Time will tell.
one is a hard shell pant and the other a soft shell pant, they cant be compared to one and other in my opinion. The catalyst vs the DH pant is a more accurate comparison.