The micro has a cool factor that no other tarp does in my opinion. But I think you'll be so much more satisfied with the standard. The extra 2' of width makes a big difference for little weight.
Micro = like HamMike said, it a fair weather tarp.
Standard = pretty much all weather except the winter winds. I've had mine in a knarly stir
A couple times and it worked great. Unless you had extreme wind blown rains and you pitched wrong.