Skinny tires are better in the snow.
The 20" Pirelli tires that come stock on the limited are junk in packed snow. Ours has 15,000 mi. (So don't tell me it's because there worn).
I'm looking for a set of rims to mount blizzak winter tires on for winter. That should help, though if I could do it again, I would've bought the AWD.