If you are satisfied with the winter performance of the all-season tires, why not just get a new set of those?
If you are not satisfied with the all-seasons, I also have had very satisfactory performance from the Bridgestone Blizzaks. Of course, then you are stuck with the burden of paying for new wheels (snow tires usually require a narrower wheel), a place to store the non-winter wheels/tires, and the hassle (if one considers it such) of mounting/remounting the tires as needed.
As the other folks above have mentioned, winter tires do make a night & day difference. I had a rear drive car that was, to put it mildly, a challenge to drive in deep snow. Good snow tires not only improve rear wheel traction under acceleration - they also provide traction to the fronts which greatly improves the steering and overall control of the car in snowy conditions.
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