It is all in the tyres. Modern high performance tyres are dismal in the snow. Winter tyres give surprising 2wd performance in the right conditions - I never got stuck or even slowed down on hills last year with mine.
This is VERY VERY true. It is ALL about the tyres. I have witnessed and experienced myself a FWD vehicle with winter tyres, out performing a 4WD vehicle with summer tyres in fairly deep snow conditions and on varying hill gradients.
The only problem is, in this country, since we only have a few days/weeks of snow, its hard to justify the cost of having a set of winter tyres fitted.
Another great alternative, to which I myself have only just had play about with in these last few days of snow, are "Autosocks"!
Worked wonders when I got stuck in the snow on Saturday night! Perfect timing too, as I had only just picked them up a few hours earlier! They work BRILLIANTLY, and are a good solution for UK unpredictable snow conditions. The only slight snag, is that they are a little more tricky to fit on the Ti with 19s, as the arch gap is quite low, and so you cant fit your arms from the top to fit the sock! Instead I found myself fitting it from the sides while placing the steering wheel on full lock from side to side....once on they self centralised and worked a treat! I was able to move away with no problems and plenty of grip!
I would recommend them to anyone! More info can be found here:-
Car Snow Socks | Snow Socks | Auto Sock | AutoSock UK
FYI the size number needed for the 235/40/19s wheels/tyres is 685