I have had both and the M/T tires are better for dry traction. The M/T tire is likely made by Cooper, but it's not a Cooper Cobra tire with a different lettering.

Worse thing about them is they don't offer them in very many sizes and they cost more. Tire store I got mine from prices the M/T tires $20 + ea. higher than the BFG tires so 4 new tires ends up costing close to $100.00 more.