4matic or not
#27
All else equal, 4Matic is better than RWD, but put wheels from a S65 with Michelin Pilot Super Sports on a S550 4Matic, and I'd be impressed if you make it out of your driveway with a dusting. Put Nokians on that S65, and you'll be the one towing the overconfident Subarus out of the ditch. AWD *and* winter tires is certainly best, of course.
Would have been wrapped around a tree with rear wheel only.