IMHO it depends on what you are doing with the truck. If you plan on hauling, airbags would be a good option. But if you are just lifting it for show/minor wheeling, just do a suspension lift. Much easier, and cheaper.
i have firestone bags on my tundra (tow rig) they are great for towing but I would be weary of putting them on a trail rig. since they werent made for that application they wont give you a bunch of lift. I get maybe 1-2 inches with 50 psi in each bag