Have owned a lot of AT tires and a few MTs. I'll try to summarize the more current tread patterns I've owned...
- Several sets of BFG ATs - good all rounder with great traction in dry conditions, but clogs with mud fairly easily. The open shoulders of the new design should help remedy this problem, making it a much better all around design. Would like to try the new design - should be a great choice if road noise is kept in check.
- Currently running Cooper AT3s on the 4Runner and our Pathfinder. Great all round tire. Treadwear seems to be good so far. Impressed with offroad traction and on road handling balance. A little more tread void than the Hankook ATM and it seems to help in muddy/loamy conditions. My first choice for an AT if you spend much time on the highway. Wish it had a little more aggressive sidewall design.
- Hankook ATM - really good all terrain. Smooth ride on pavement and good dry trail traction. Would pick AT3s over the ATM if you plan to spend some time offroad.
- Goodyear Duratracs - Great tire on and off road. Was surprised at how well it handled on road and even on the highway. Tracks straight without pulling the truck around. Quiet ride when new - grew louder with age - got to be pretty loud near the end of its life. Good choice for a more aggressive AT. The AT3 is really good, though, so don't know if the increased noise of the Duratrac is worth the minimal performance gain over the AT3. Looks good and got surprisingly good mileage out of mine (E rated).
- Toyo Open Country MT - Excellent traction offroad and decent road manners for an MT. Quiet for an MT, but still has a noticeable hum. Heavy tire and has that MT pull to one side (common with MTs that have an asymmetrical tread). Sticky tread is on the soft side so watch the tire pressure and wheel balance closely to keep treadwear even.
-Hankook MT - Great aggressive offroad tire with decent road manners and decent road noise. Good treadwear for an MT. Heavy and tough tire that can take a lot of abuse and works in all conditions. Symmetrical tread means less MT pull - tracks well and wears evenly. Top choice of the MT tires I've owned if it'll be on a daily driver. Got louder with age, but still not terrible. Good tire that is really a mild MT or super aggressive AT.
Have also run Dunlop MT and MaxxTraction (really good tire but discontinued), Pirelli Scorpion AT (old and new tread designs - newer design is a great road tire for occassional offroad). Bridgestone AT - good road oriented AT.
Have run P, LT-C, LT-D and LT-E. I think a lot more is made of the differences between sidewall ratings than is really there. If you plan to go offroad stay away from P tires and look closely at tire weight, as well. One companies E rated tire that is light (meaning not a lot of rubber) may be less harsh than a really heavy C rated tire. The BFGs aren't heavy tires so I wouldn't worry about an E tire from BFG.
Summary - Best AT I've owned is the Cooper AT3. Want a more aggressive look, then go Duratracs. Best MT for a truck that will be on the road is the Hankook MT. Think that the new BFG AT will be a good tire and would be a tough choice against the AT3. Running 275/70/17 AT3s - good fit with no rub.