Thing is, Tire Rack didn't "pick" anything. This is their survey results, which comes from customers, not Tire Rack themselves. Additionally, with only about 200,000 reported miles on the survey, it's not always the most accurate. There is a lot of early adopter "shine" that skews new tires high in the survey. Honestly, how can you rate snow and ice traction when the tire was introduced after the last winter? Compare the Premier A/S at #1 with 200,000 reported miles to the MXV4 at #4... with 22,000,000 reported miles of reviews.
If you want to see what Tire Rack themselves think of the tire, it was included in a formal test back in the spring. It tested tops there, but not by much.