I have a xi and M. Xi has stick RFTs in the winter and did perfectly. The M has blizzaks in the winter and did very well. But, there were da that the M stayed home and the xi took its place.
AWD an 4WD do not do anything for stopping. That's all about your tires. But they help with steering and going.
Here's a question. With your 335i, how much are you going to spend on winter wheels and tires and do you have a place to store your other set for the season? You're not saving $2,400. But, even after buying winters, you will still be ahead of the game.
'15 3500 HD Dually