Cooper MnS seemed like the standard in the mtns in CO when we lived there.
How long they last is directly proportional to how much dry pavement you drive and also how much while towing. In general, I've found dedicated snows to last about half as long as ATs with mixed use.
Presume you have a 4x4 so that lessens the need for dedicated snows.
For all condition traction, better traction in deep or soft snow and bit better longevity I run siped mud tires in the winter. Most of the traction of snow and ice tires, better on unplowed or forest roads.
