Maybe it was size and lift, but all I have to say is my first year at Moab was with 245 BFG A/Ts and no lift, and my 2nd year was with 265 BFG M/Ts and a 2" lift. The M/Ts out performed the A/Ts like gang busters. And I have heard bad things about the BFG A/Ts before. Now that I have rolled with street tires, A/Ts and M/Ts, I can safely say that the M/Ts out perform everything else when it comes to traction on and off road. Snow, loose rocks, mud, slick rock, the M/Ts own over the A/Ts....but again, could be my lift and larger tire size helping too, I dunno...

I'm sure different brands of A/T and M/T compare differently. But in general, when talking about traction, I think a knobbier tire is going to perform better in 99% of off road applications, like PB said, I've never seen a full time rock crawler with A/Ts. That said, the VehiCROSS is NOT a rock crawler so I digress...

Bart