It seems like most people like 10's for looks, but no real comments on advantages offroad. So for the person initally asking the question still to be answered is: what are YOUR goals for your truck? From that will come your answer, and not anything anyone on here decided.
If you want looks, I'd say 10's without a doubt. But there are disadvantages to a wider rim aired down -- so that's a consideration also. Few of us will be running bead locks (other than the "fake" ones) on our trucks, so it's a possible issue for you if you will be airing down much.