Wow... a lot of people seem to have a real love for BFGs....
I don't.
Sure, the tread lasts near forever on RBVs. But I haven't been impressed with their abilities. And, IMHO, the tread pattern is too tight.
The last set of AT tires I had on my Ranger were Sport King Steel Radial AT tires in 235/75/15. I'd say they made it about 45-50k miles before being shot. They did everything I ever asked of them during that time, including being in mud, sand, snow, ice, hardpack snow, dirt, loose gravel, and the like.... all while on a 2wd with an open rear diff. Matter of fact... I can't recall ever being stuck with those tires. I can't say the same for the stock POS tires that came on the truck or any of the other tires that I tried on it (although I will say that I forgive the mud tires I had on for awhile for being stuck.... I shouldn't have been where I was, a lifted Chevy 2500 4x4 got stuck just getting back to me, took a Ford backhoe to extract me).
I wanted to run the same tires on my F-150 but had trouble finding them when I needed a set. Settled for some Nexen ATII tires that I wasn't completely satisfied with the tread design, but they've proven to be quite capable. I ran two different kinds of AT tires before that on my F-150 and both were worthless (BFG knock-off and a knock off of the old Remington tires), in the winter I needed 4x4 to go anywhere. With the Nexen tires, I spent a lot of time riding around in the winter in 2wd. And with the addition of a rear locker before last winter, I almost never used 4x4.
When I look for an AT tire, I consider the design of the tread pattern (can't really tell you any particular feature, just sort of a judgement call), then I jam my fingers down in the tread in a couple spots to see if my fingertips will hit bottom or not (I have somewhat large hands, not trying to brag). If I'm iffy on the tread pattern and can't get my fingers in the tread, I pass on it, it will not have enough bite to suit me.
I work construction, have for a number of years now. Getting off the road is often a requirement, and doing minimal damage there is usually preferred. An open tread pattern seems to do well for not digging big holes without going anywhere, thus my choice.
A contractor that I've worked with some over the years loves BFG tires, but often when he gets off the hard surfaces and into dirt or grass, they spin. Nothing like turfing a yard to irritate a homeowner. Usually doesn't take much, wet grass and a slight slope will do it, it seems. The more open tread patterns I run don't seem to do the damage that his does.