We ride with some friends who have a RZR 570. Ours is a RZR 800. We can easily outrun them on a road but on the trails we ride, we're going slow and they have no problem keeping up. So far, the 570 will climb anything they've tried (however, they're not daredevils). I don't know about pushing snow. I put a plow on the 800 3 years ago but we haven't had enough snow to test it the last 3 winters.
With any of these, don't plan on keeping up with ATVs on steep roads. They're considerably heavier and with 2 aboard, an ATV over about 700cc will run away from you.
