Air bags or Timbrens

I'm currently waiting for my ordered 2016 F350 crew cab shortbed to pull a Montana fifthwheel. With a pin weight of close to 3,000#'s, I know the rear of the truck is going to squat and I don't like that look. With that said, what would be a better supplemental suspension, air bags or Timbrens. My friend has had both and he prefers the maintenance free Timbrens but I want what is better, both in ride quality and reliability.