We have an X5 3.0 (2003, pre x-drive) and a 325xi (e46). The 325 goes better in the snow, with stock tires, than the X5. The lower weight helps a lot.

In really deep snow, theoretically the X5 should do better due to the increased ground clearance (7.1" vs 5.5"), but that didn't seem to matter to us. We have pushed snow with the 325 bumper when the X5 came to a stop. Both have factory tires, and real winter tires would help both of them. As with any vehicle, the tires matter.

Our 325xi has the full BMW Canada winter package, with heated everything (except steering wheel) and it makes a great four seasons vehicle.

I think both the new X5 and the E90 3 series have evolved, but the comparison may still help.

Jeff

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue