My nephew is a professional Alpine guide in the Canadian Rockies, and I have many friends who are guides in the Pyrenees. I asked them about 4WD before buying my van. They all told me that when it comes to snow, company cars are 4WD for image, but no one has 4WD for their personal cars, because of weight, mechanical complications, and maintenance costs. They all said first class winter tires are essential, and chains for emergencies. Rocky off road tracks are a different topic. I have always felt that in that environment a Jeep is the logical choice, but in that case I would almost always prefer to hike than be in a vehicle. So, I bought accordingly, and very happily have never looked back.