Posi, good for icy roads?

I like a suegrip over an open dif. in the winter. I wouldn't change 1 way or the other just for snow. In the north east we get just enough to be a pain.
Years agao when a kid,I had to climb about a 1/4 grade to get home that had about 3" of snow. I ended up spinning my way up the hill melting down through the snow while doing a little dance the whole way. I wouldn't not have made it with 1 leg.

Stop in town to make a left hand turn one time w/open diff and stopped right on top of an ice patch. There I was stuck with clean blacktop under 3 wheels.