I know you're asking about Goodyear vs. BFG, but does noone run Dunlop Mud Rovers? I've had 4 sets and they all were great tires. worked well in the mud and on dirt hill climbs (not much rock around here) and lasted between 40-50,000 miles. Only thing I've seen is sometimes they needed more than average weight to balance them.
ive run them, wouldnt balance for beans, rode like butt, but lasted forever