I've had two wranglers before this with the 4.0 and a manual and the low end torque was great for offroading, no matter the gear/tire size. On my '12 JK there doesn't seem to be the low end torque of the other motor and that may make rock crawling a little more tough if you don't get the Rubicon with the 4.10 and 4:1. I do look down on those who get automatics, but it's still up to you.
2012 JK Rubicon, Crush. RK 1.5" Max Travel, Bilstein 5100, 35" MTZ.