I like a shorter and more slippery saddle on my mtb, so that I can get behind it more easily going down steep descents. The saddle on my road bike is too long and flat for that, but I can shift around a little on longer rides. But there's not a huge difference. If I could only find one comfortable saddle I'd use it for everything.
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett