My old truck is a 95 ZR2 so it came from the factory with the 31x10.5x15 bouncy BFGs (I love my new 18s) and I put a few sets on before I switched. I have an adventure motorcycle and we talk about the road/off-road ratio, a tire is made for 70% road use and 30% off-road use. If I rated 4x4 truck tires like this, I'd rate the BFG All-terrain radial TA (KO) as a 50/50 tire and the AT3 as a 70/30. But overall I'd rate them equally, I'd not give a thought to going with the BFGs over the Coopers if you are any type of wheeler or as CVcolordo said, hit snow/mud routinely. Coopers are better at urban areas and freeways and Moab type stuff.
It seemed like the BFGs got ground down and gave me "the shakes" and obvious uneven wear faster than the Coopers. My oldie has always eaten tires, but the AT3s last longer, I don't have to rotate them as often. What's confusing is it seems like the rubber compound of the AT3 is softer than the BFGs, you'd think they'd wear faster, but they don't.