I think it depends a bit on the type of trail and rock you see, as well as if you want the tire to be effective in snow/ice. Many say that MT/Rs are much better in snow/ice, and they definitely have a better track record in very sharp rock. So far I've loved my MT/Rs because they have given me a lot of confidence on the trail, and are tolerable on the road as well. Can't yet vouch for total miles (I have about 7,000 on mine and they're wearing great so far), but at this point I would buy them again.

89 xcab 4x4 22re. 1.5" BJ spacers, 3" shackle and AAL + fender trim. 33x12.5 R15 MT/Rs, 15x10 rockcrawler streetlocks. 488 yukons by ZUK, detroit rear and true-trac front. 2 1/4" cat-back exhaust. Redline gear oil. Rear bumper by bentup.com.