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
Previous BMWs - 2012 135i MSport 6MT Jet Black(sold), 2012 135i MSport LMB DCT(sold), 2011 X3 35i MSport VR (sold), 2009 M3 Sedan AW (sold), 2008 535xi MSport AW (sold), 2007 328xiT Barbera (sold), plus 11 others in the 70s & 80s.