welcome aboard Jack!
while it is true that rwd is prolly the worst performer in the snow among 3 set ups, there are other factors that needs to be thrown into the equation. first is the tire. imo the most important component of the car that is most oft over looked. snows are good, all seasons are marginal, but it depends on the brand. they are important, not because of the go, but more important for the stopping grip.
second, weight distro between the front and the rear. bmws are pretty good in this regard w/ near 50/50 split. where are most american muscle rwd cars have a heavy front and light rear, which makes for easier spinning out in the snow.
anyway, if you have a solid winter car, i'd take that around. you won't have to invest in the snow/rim combo (you should always get the combo, it'll be cheaper in the long run.) but more importantly, you won't be putting your new ride at risk on slippery snow conditions, not ot mention salt and other crap that's horrible for your car.