I could be completely wrong, but I think of AWS as more of a performance option than safety option. Great for getting started and accelerating out of turns when in the snow, but not sure it's really going to help otherwise.
Snow tires will help with braking as well... they're more of a safety thing.
My last two cars....
Summer tires + FWD... terrible getting traction in the snow.
All season tires + AWD... love it, but haven't had any 'oh shit' moments where I could say snow tires may or may not have been any better.
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