I dunno. When I bought my aveo, which was already 4 years old at the time - it had pirelli all season tires on it. I didn't buy any tires that winter. The pirellis were actually really good! They wore out and I replaced them with bridgestone potenzas for the summer and some hankook winters for the following winter. Admittedly the hankook's were cheap ($400 mounted/balanced), the used all season pirellis the car came with were way better than the brand new winter hankooks (which are OK).
I've driven through our quebec winters with bald tires and never again... scary shit!
a guy I know has the general altimax arctic on his jetta and is very happy with them. heard good things about x-ice tires as well. I'm not so sure about the "any winter tire is better than any all season tire" idea, but I'm sure it'll often end up being true just the same.