Personally I dig a fixed mtb in the snow. I run some gnarly 2.1" knobbies and I float but I also get traction. Skinnies work for sure, but sometimes you're on some hard packed snow or snow on top of ice and then I'll take the knobbies any day.
On the other hand, the Steamroller has tons of clearance so you could throw on some CX tires and get your tread on.