If worried about the snow...
A three-peak mountain snowflake (3PMSF) symbol branded on a tire's sidewall indicates the tire meets required performance criteria in snow testing to be considered severe snow service-rated. Originally used as a designation for winter tires, the 3PMSF symbol is now featured on some all-season and all-terrain tires with snow performance that meets the testing criteria.
- Testing measures a tire's acceleration traction on medium-packed snow only. Braking and turning on snow, along with ice traction are not components of the test.
- Tires branded with the 3PMSF symbol are expected to provide improved snow traction beyond a standard M+S branded all-season tire.
So to put in different terms if a regular all terrain tire is rated at 100 then the snowflake symbol moves the rating to 110. These qualifications were put into place by the tire companies (USA) and rubber companies(Canada) to help people simply identify the tire (and sale more under the pretense that this is the only tire you should use in the snow). So unless you are traversing the artic I would think that an aggressive all terrain would suit you well in the snow BUT the snowflake stamped tire MAY do a tad bit better. Driving ability and skill is gonna help you more then the tire in most cases.