I have two bikes that I've commuted on in the last couple weeks. One is an old steel mountain bike with a rigid steel fork. The other is an new aluminum mountain bike with a plush suspension fork. I like the ride of both, but do prefer the bike with the rigid fork, just because my commute has some wicked hills. If it weren't for the hills, I'll probably use the bike with the suspension fork, just because the ride is smoother over potholes and such.