Only ever used BFG, currently on my second set of KM2. Obviously I can't provide a comparison with other brands however I can say that the KM2 have never let me down on or off road. Considering they are a muddy they provide very good contro......
I just saw the note re poor length of life (re k's) out of the BFG's and wonder about tyre presures - I had 285/75/R16's on my 80 which as mentioned was circa 2,850kg's depending on how much fuel I was carrying and how many bods (it all went up from there) - accourding to a weigh bridge it was well balanced at 1,800kg's over each axle.
I was always at 34psi unless I needed to go low which I did a lot and my deflators are set at 17psi.
I did a few trips into SA (flinders ranges) but mostly Vic High Country - it was also a daily driver so heaps of black top.
maybe consider your presures if you haven't already - this has worked for another mate who chewed through some MTZ's in an unreasonably quick time with his 200?
good luck, hope this helps.
PS we put Hankook Dynapro AT's on my wifes 90 series prado and they have done 50,000 so far (two trips to the Flinders ranges, yes we like it there, a few high country trips, several desert trips and daily commuting) and they look like they have hardly worn - quiet, great road handling and never let me down off road so a good tyre also.
These have made me start to favour AT's over MT's as well.