I also think that having two truly independent motors is vastly superior to one motor and a Torsen center diff sending it front and back.
The quattro would use braking of one wheel to send power to the other side on one axle, with a traditional diff. I haven't really figured out what the Tesla does from side to side. But it seems to work great!
We didn't get a lot of snow after Dec when I got it, but what I did get to play in it was very impressive.