[Sherpa 60]

Those boys at Peterson publications have run off-road comparison tests over the years on Mud Terrains vs. All Terrains.

Basically both tires performed much the same with the MT having the advantage in mud and a slight advantage on rocks with the AT having the advantage in sand and snow. Not radical differences, but perhaps enough to steer you in one direction given the type of off-road conditions you typically expect to see.

I personally run All Terrains because I feel they perform better on the road with little sacrifice off-road to the MTs for the conditions I experience. Quiter, better traction wet or dry, better in sand (which I see a lot more of than mud) and as a bonus less expensive. I often have to travel long distances to get to the trail head. With a fully loaded vehicle and often sub-par roads I want a good stable road tire that will perform wet or dry. The ATs have worked well for me in that regard.

As to the comment about ATs not being good off-road tires? Don't forget ATs are the go to tire in the Baja 1000. Granted a specific focus, but certainly not to be doscounted.

And...why 255s??? I get the English look thing, but 10"?. As long as you get the right load rating and sidewall stiffess not qiute sure why a slightly wider tire wouldn't be a better choice.