While the popcorn is cooking.........
Funny sooo many sets of add on airbags are sold every year. Wonder how many of he forum weight cops actually have bags on their trucks and won't admit it???
To the OP, the 3 or 4 major brands are all of similar construction and quality IMO.
The differences are some models have internal bump stops so you can't pinch the bags when deflated if you bottom out the suspension with no air and then there are a couple different kits with on board air and auto regulating systems.
You're pretty safe with any of the popular brands.