Agree with the posters who say that AWD does NOT help in braking on snow or ice. I have had both AWD and RWD; and AWD does help get going, but not stopping. I have also driven FWD in the snow, and like it the least.
Also, agree that drivers of SUVs & trucks with AWD tend to "overdrive" their vehicles falsely thinking they can stop and handle better. On most mountain roads/passes up here in the winter, the majority of vehicles in trouble will be SUVs/trucks. That is just an observation, not backed up by statistical facts.
2012 328iTouring xDrive Black Sapphire
Waiting for: 2016 340i xDrive MPerf. EBII
Previous BMWs - 17 others since 1971.