ARB in the rear is the way to go. The rear will push and your turning radius increases when the rear is locked up. Not only that, but when you are climbing a ledge that you cannot hit square, turning off the ARB prevents you from crab walking. Take a look at what Dustin Webster has had to say on Pirate about ARB's in the rear. Speaking from experience between my two set ups, one with an aussie and another with an ARB, I prefer the ARB.