You know, 911 are such great cars, even the rwd are surprising good in the snow, the engine over the drive wheel gives it added traction, like fwd with the engine in the front.

But cornering in foul weather is a different story, with so little weight over the front wheels, it will tends to plow until you lift off then it will snap around, over the years Porsche has tamed the beast but it's still there. 4wd has the advantage of the front wheels pulling through the corners in foul weather. In any case, modern traction control tends to mask most of the deficit and you really can't go wrong picking any 911 versions.