Long arm vs short arm ???
Does "my guy" lift pick-up trucks for a living? Sounds like it. Your lift size should depend on your tire size. Don't go higher than you need to. Six inches is a lot of tire. The higher the lift, the more susceptible to rollover from the higher COG. But, if someone is driving the typical "monster" pick-up, he wouldn't care about that since paved roads are reasonably level.
The JK I have now is my fifth JK. On previous JKs I have had both long arm and short arm lifts, and for 3.5 to 4.5" of lift there was minimal difference between the two. Having the correct shocks makes just as much difference. The best riding and best handling suspension I have had to date is my current AEV 3.5" lift, with Bilstein reservoir shocks. The AEV lift actually retains the stock control arms and uses geometry correction brackets, but it rides and handles better than any prior suspension I've used, including a prior long arm suspension.
Thanks for the thoughts, I'm thinking of doing the rubicon express 3.5" standard coil system with bilstein shocks, with the option to upgrade to their extreme long arm later when I have more $$$


