RE has well engineered kits that flex (articulate) well and they also have good customer support. The RE kits bolt-in, so you don't have to weld much.
Body lifts will give you clearance, but don't help with suspension articulation. Also, you run into lalignment issues - steering, radiator/fan, shifters, etc.
Let me tell you about my 98 TJ - I bought it cheap because the previous owner destroyed the rear axle with 35" tires. The Dana 35 (rear) is a light duty axle. The 4" short arm drove poorly due to suspension angles. I am in the process of installing a Clayton long arm suspension (welding required), Ford 8.8 rear axle, and Atlas 5:1 transfer to correct all the issues from the previous destruction and give me lower gearing. Hey, the 1" body lift is good for one thing - I didn't have to hammer the floorboard to get the Atlas in there!