Im running a d30 up front and wheel in mud or sand dunes at least once a week. I ponder this op question quite a bit like every saturday.. Axels and engine swap are really the only upgrades big ticket items I have not done yet.
When it does go, Im going dyna or Currie. Both have been around the block and the tech help at both companies is there . My last jeep had curries and I wheel with a couple guys running PR60 setups. I love the slander above bashing customer service yet admitting has never used their products or their customer service. Over 50 years in the offloading business, you would think if they were that bad no real teams would use them. Have you ever been to an event and not seen currie/dyna goodies on pretty much every jeep? On most applications unit bearings are the weakest link once you have a engine swap.
The transfer to the housing/person doing your gears, ultimately will really make the biggest difference on a housing swap IMO. I would suggest finding the best driveline guy in your area and talk to him about brand preference , if he's done a bunch of curries/ dynas and never seen a G2/terafles do you wanna be the guinnie pig?
2011 Jk 2 door 6 speed. 5.13 gears, 1350 driveshafts, cooper sst+ 35s, warn 9.5, various armor, 1/4 pounder bumper, 12 inch King coil overs, CB, still running the dana 30 sleeved and gusseted up front. Someday wanna go with 1 ton axels but for now I love my JK.