I've had mixed results with wide vs. narrow tires in deep snow. If there is a bit of a crust on the snow, sometimes I find the narrow tires are easier to get up on top of that if you do break through. The wide tires can be harder to do that with if you have to push them through then on top of the crust. My old Swampers worked great in the snow (siped TSL-SXs) aired down around 1-2 psi. One time I was breaking trail and nobody could really follow me (even w/ 35s) since I really wasn't "breaking" trail so much as floating over the top of the snow and not packing a trail. The next rig had to do the main trail breaking. But you can probably run across snow (or other trail) conditions that will make one kind of tire work well and anther one do poorly. That's why I run a few sets of tires, gives you a choice in what "shoes" to wear.