Air Bags vs Air Shocks

I need your help in making a decision. I have a Ford F-150 V8 and a 3023 Trailmanor. When I am hook up the Trailer it sets the rear of the pickup down. TM pulls level however the Ford F-150 is not level. I want to raise the bed of the truck and need to know Pros and Cons of Air Bags vs Air Shocks. Which route should I take

Looking forward to your answers.

Mike
Sugar Land, TX