Go with 4WD
As everybody has been saying, go with the 4WD. It's like another thread in here is saying about racing WRXs.... if you're going to race, go on KILL. Same with 4WD. You probably don't NEED it if you can wait for the plows, but it's nice to have when you realize you put yourself in a bad situation like being in the woods or on a slippery boat ramp.
When in America, I was driving a new Trailblazer with locking diff rear. I actually had a hard time getting it to break lose in dry and wet. I'm sure on snow, I could do it a little easier, but I was very impressed with the amount of traction. 4WD and better yet, 4lo just takes the cake. Also, you have to remember, you get better ground clearance, different suspension capable of taking larger tires and in some cases skid plates.
Only way I'd only go with 2wd is if towing was the BIG priority. I'm talking about doolies that need to pull houses. Because with the added weight of a transfer case and front axle, that reduces the tow rating.
But like everyone else said, I've had two trucks in my life, both times I insisted on 4WD and locking diff.