With the snow we had I learned a new lesson. I'm running Eagle F1 asymmetric 3's at the moment and went out to get my niece who got stuck in it and then of course I got stuck. The Audi boys have told buy a set of michelin all weather tyres next time. Absolute crap in the snow but I thought I would get away with it
I vaguely remember some discussion on that recently

Here is what VW have to say on their website -
http://www.volkswagen.co.uk/need-help/owners/winter-tyres-4motion"Do I need winter tyres if my car has 4 Motion?
Volkswagen's 4 Motion definitely offers an advantage delivering drive to the road, although
it's a mistake to think that 4 Motion means you don't need winter tyres. When they're fitted, winter tyres increase the 4 Motion advantage significantly and will make sure you get the best results out of your 4 Motion system.
4 Motion doesn't do much for steering and braking. Fitting winter tyres provides better drive, steering and braking."
We live in the northern half of the UK. There are usually a few weeks of snow and ice every year. Some years more. We were going to buy an A3 with Quattro for my wife. After reading many articles and watching many videos, we bought a FWD A3 and fit winter tyres every Autumn.
There are a lot of myths about 4WD. Google search - 4WD myths.
Our FWD A3 accelerates really well on snow AND ice.
More importantly it stops really well in those conditions too, because the tyres have plenty of grip.