One thing to add, when breaking on snow, by just letting the break go without ABS, By slipping, you're piling snow up in the way of your tire, when snow piles up to a certain shape/block, it does help you to slow down quicker.
Ever hit a block of packed snow? I have, and it wasn't fun...
But when sliding, of course, you're sh*t out of luck....
But when on ice, with or without ABS really doesn't make much difference, neither does all wheel drives...