Hy,
air bags acts like a cushion, softens a lot the ride and helps unload some weight from the leafs. The problem with leafs is that creates a harsh stiff ride bad for off-roads.Unless you have a good shackle attached to the leaf pack which allows a good up-down movement I've added one more leaf and 2 bigger helpers and ride was very stiff, Now with air bags it softens a lot the ride and i hope i can adjust the pressure for highway and off-road. Airbags cannot be that bad big rigs are using airbags and are carrying huge weights without rolling and also Earthroamer are riding on air bags.
Concerning the recoil action when the wheel goes into a hole i've just bought the Daystar airbag craddles, so the lower part of the air bags is no longer attached to the rear axle, allowing free down movement for the wheel. i'll do some tests in avril.
http://www.youtube.com/watch?v=r4QBG3izhyA
I've bought Bilstein 5100 shocks because is a monotube design. Good reviews and price. need more there is Bilstein 5160 remote reservoir.
Other shocks you've listed are adjustable, which means one more task (i don't need that), or very good off-road racing shocks.
True good shocks controls sway, saw that off-road racing trucks have 3 huge shocks per wheel.
hope this helps
incognito
p.s photo one more leaf and 2 bigger overload helpers which engage earlier. professionally installed. with 4000 lbs weight truck was sitting on the overload leafs didn't like the ride. added airbags and truck rides 1 inch off the overload leafs with airbags at 25 %. a little more sway but a nice soft ride.