I used to run 33x10.5 BFG AT KO's as my only tire. I loved them. Great on road. Wonderful in snow and ice. As far as mud went, I think you would be hard pressed to find a better AT tire for mud. It is however not a mud tire. My only complaint is the bead protector. Tends to collect debris and result in bead leaks.
That said, a MT is always gonna outperform an AT in the mud.