What's the difference between Michelin Pilot Alpin (last season tires) and the Alpin PA2 (new tire)?

Will this be a good choice for SE Michigan winter?

 

Basically the PA2 is the newer, more updated version of the original Pilot Alpin. The PA-2 has a little differ tread compound and design to further enhance snow and ice traction, but still retain good handling traits in the clear days. Almost all of the Pilots Alpins are gone or discontinued. Since the PA-2's are newest construction/technology and have better availability, that's the one I'd go with