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.
"Man Show" def has a good point. Always go as narrow as possible with snows. If you already have the wheels or just money to spend, the 16" setup will open up a world of more options for tires...ESP snows!
But IMO go with something cheaper for snows from Hankook or Sumitomo. Blizzaks are a great snow without a doubt, but when it comes to snows compounding and quality are on a totally different page than HP or UHP tires. A softer compound (cheaper tire) would typically give you accelerated tire wear for summer applications, but in the winter where days aren't hot it'll actually be more beneficial to have a softer compound which will actually allow for more flex in the tread pattern...thus allowing better traction in winter applications. But IMO save your money on the Blizzaks.
You're kidding yourself if you think the wheel diameter or 10mm of width matter that much on a winter tire. Get a good tire at a price you can deal with and keep the overall diameter close to 25".
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