If AWD is so much better, then why do I see so many SUV's in the ditch during snow storms.
1. Probably because S/CUVs make up a greater proportion of vehicles on the road: the more there are the more you will see. Your observation is akin to saying, "I never see motorcyles in the ditch during the winter; ergo they must be the best winter vehicles."
2. How do you know ALL of those S/CUVs are optioned with AWD?
3. The observation is moot is anyways: AWD doesn't significantly change your ability to keep out of ditch. It helps in traction. People are in the ditch because
they were driving too fast for conditions, no matter what car, powertrain or kind of tires they have on. Short of a hovercraft or teleporters, no technology will change improper driving decisions/behaviours.