AWD is the only way to go, especially in northern tier states. Learned to drive in MN, and spent 20 years driving in AK, and would never own a RWD for a daily driver. Even on dry pavement and in a climes without snow, AWD is a safety benefit.
However, the drivetrain does little or nothing, especially on snow and ice, when braking. The only vehicles you see in the ditch in Alaska are 4WD/AWD!
Studded tires are essential on ice covered surfaces. The Swedes and Finns, however, have established that braking distance with studded tires on bare pavement is actually longer than all-season rubber.