4x4 is only good in snow when you can lock the diffs (or like on my rangerover where it picks up wheels slipping and locks them for you)
was in the middle of nowhere a couple of years ago and we got hit with heavy snow, the farmer where we were had to get home on his tractor, (couldnt get his pickup to move because of traction control problems), he was convinced that we were not going to be able to get home, took 5 hours to do 45 miles but got home with no problems whatsoever (came to one hill where nothing was getting up, sat at the bottom waiting to see a clear gap all the way, once it was clear just drove as normal and it went straight up)
on the road back down to my house I did some playing, the only way I could get it to slide anywhere was sideways on sharp bends, accelerating hard / braking hard didnt slip at all, put that down to a combination of good tires and good abs system.