I'll base things like this
Siping is always required for winter traction
for hard pack and ice, you need biting edges
the new STT appears to have alot more than the old one
But still not something I would state would give it an extreme winter tire
The large lugs and channels will be great in deep snow as like other mudders and the extra siping will help tremendously more than most mud tires
i'll bet in snow deeper than 5", these STT's will probably blow the BFG a/t's out of the water
but in anything less and hard packed w/ ice
the AT's siping and soft compound will defeinately be much better
in Winnipeg, whre our climate is generally snow on ICE on our streets
the Goodyear Wrangler AT/S's dominate by far
far better than the BFG a/t's as they are a even softer compound with much better edge biting design
but in the deep stuff, they still work decently too