There's no pat answer to this one. I've owned both a FWD Honda Civic and an AWD Subaru outback. In my experience, the worse the conditions (steepness of road, depth of snow, iciness, etc) the more the AWD will outperform the FWD, all other things being equal (drive skill, tire quality). That said, for average winter conditions, FWD with a good set of snow tires will get you most places. Although WSP won't care about how good a driver you are or the quality of your tires. They will make you chain up where required. One other consideration. AWD produces poor mileage. 'Tis the nature of the beast. You could consider using the gas money saved on a fuel efficient FWD and get a really good set of dedicated winter snow tires. Then feel happy you're doing a little something for the planet.