For a winter tire, you want the tread patch to be as reasonably small as possible so your tires cut through snow and slush. A wider tire contact patch will tend to float on top of the snow... similar concept to how a snow shoe works. The bubblier side walls, although they may look stupid, will help protect the faces of your wheels if you should happen to brush against a curb and will also give you a slightly softer, more comfortable ride.
For reference: my stock 17x7 WRX wheels came with 215/45/17 all-season tires, but now I have a set of 205/50/17 winter tires mounted on them.
07 WRX (Albins 5MT + Blouch 20G)
Jorge Carrillo Tuned (365 whp/340 wtq)