As mentioned use both, airbags will help stiffness the rear end up but the WDH is needed to replace the weight lost from the front axle.
Here's a good video showing the difference between airbags and a WDH:
Fastway engineers Jason Harper and Matt Barnes investigate the difference between using either a rear axle air bag system, or a weight distribution hitch to ...
youtu.be
Drop the air pressure in the airbags to 3-5 psi when your not loaded. I don't notice mine when the pressure is kept to a minimum.