[touareg]

I don't think there is any AWD system in the cars you're considering that is significantly superior in the snow. Just thrown on some good winter tires and you'll be good to go.

SH-AWD can proportion torque between the two rear wheels to some extent, but this is mainly for better handling in dry/wet roads, not so much for better traction on snow/ice.

I'd be interested to see if the Terrain Response system in the Land Rover would give better traction, given the same tires and conditions as the other cars. But the AWD system in the LR2 itself, Terrain Response aside, doesn't seem to be particularly special.

My B6 A4 had quattro with a constant 50/50 mechanical torque split, with ESP braking the individual wheels if necessary. The only two times it was ever stuck, it was due to insufficient ground clearance (got beached on icy snow), not because of anything quattro-related.