Looking at the tread they're probably better in mud than BFG ATs but the duratracs will probably dig in sand, where the ATs excel. I think the BFGs would be better on rocks too, because even at 10psi, a 10 ply tire doesn't flex as much as a 3 ply tire.
I have never used either tire, I'm just making an educated guess on specs and tread pattern.
I've got the 265/75 Duratracs which are 6 ply. If there is one common complaint I've read about the Duratracs is that the sidewalls are too soft. I friend of mine bought 31"s and he had the same complaint. He was complaining about cornering at higher speeds and I told him its a Nissan Hardbody 4x with 31's, its not intended to race around corners:lookout: