Also gotta keep in mind apples to oranges. As DW said use of the vehicle makes a huge difference. And, Imho, an aggressive tread is never going to last as long as an all-terrain tread. Those bfg's are pretty aggressive compared to the cooper's. More aggressive tread = less rubber meeting the road = shorter life of the tire.

Tires requirements seem to always be a compromise between, intended use, load ratings, tread pattern, tread life, and price.