Quads are rad and definitely a good all-year thing. I find the problem with quads in the snow is the ground clearance as much as anything. I have a Kawi Brute 750 with some decent sized tires on it and it's pretty much the best in the snow out of everyone I ride with and it still gets high-centred and stuck it's deep enough. I don't even go out in winter or anything though, just the trails I ride can have 2-3 ft on them into the summer. Wanna build some jumps up there... *rubs hands together scheming*
I live my life one storm at a time.