The Outback and Forester get lumped together but to me they are very different cars. The Outback feels and drives like a very large station wagon while the Forester feels and drives more like a small SUV. This makes them different cars in terms of blind spots, road noise, and driver feel.
Most AWD systems with the right tires will handle road/highway snow and ice no problem. Where the Audi and Subaru systems really shine is when there's a lot of resistance on the tires. I've been in a Subaru that made it out of mud field compared to seeing a BMW X3 that couldn't get out of heavy/wet compacted snow that built up between the chassis and ground.