Depends on your intended usage and the look you are trying to acheive.
31x 10.5 on 7.5" factory offset wheels = 3.5" with some rubbing on curbs, cornering and hard bumps.
33x9.5 on 7" factory offset wheels, very little rubbing under street driving conditions, but may contact the inner lip when articulating off road.
33x 10.5" tires on anything wider than a 7" wheel will contact more than the 31x 10.5" will.
33x12.5" will need a minimum of 5.5" and possibly some body lift as well, but I think that will have some major contact under hard use.