inhave need driving in snow my entire life from 70's rear wheel to all sorts of FWD, a 2004 RWD Cadillac CTS. If you drive a lot in snow, but snow tires . Worth their weight in gold. That being said I replaced the stock Continentals with Michilen Latitude All Season last fall. They were much better in the snow. The don't get quite the gas mileage of the continentals and are a tad bit noiser but the traction both wet and snow is much better.
As far as ice traction , I stay home . Life is to short to drive in freezing rain .