Which one?
We can't tell you what axle you need to choose to put in your Jeep. You need to weigh all the options, figure out your budget, and determine what size tire you are going to run. You also need to take your driveshaft angle into account and all the other little things that come into play.
If we didn't have a good shop nearby that could retube our existing axle, it wouldn't even be an option because shipping quickly negates any possible cost savings. Even at that, the junkyard 9-inch build and rebuilding of the rear axle don't really take into account all of our problems. Our shafts are starting to twist, which makes the 33-spline G2 axle more attractive, but then we get back to the blown-up ring and pinion; it makes us lean toward something stronger than a TJ Dana 44 ring and pinion. Which do we go with? You'll just have to tune in next time.