Very interesting video which tested which is more effective: AWD or Snow tires?
The test conditions were:
FWD with All season tires
FWD with Snow tires
AWD with All season tires
AWD with Winter tires.
The results may surprise you. Basically, snow tires are the most important factor. AWD was useless in the snow with summer tires.
And finally ... All season tires with FWD was completely useless, and could not handle the snow at all.
AWD with snow tires was overkill, but helped, and was better than FWD with snow tires.
The moral of the story is to get winter tires, even if you have AWD.
If you are driving around in the snow with summer tires and FWD, you may not be able to handle the snow.