Both air springs' brands are about the same. Compare warranties.
It takes such a small volume of air to change PSI on 'em, a manual bike pump is sufficient. AND...if you tow the same trailer with the same weight, you'll know the PSI that you need, every time, so adjust on the fly isn't needed.
Varying loads, changes needed. With an on-board battery in the tool box on the GN (winch, lights, etc.), I have there with it a high volume 12v pump, that's easily accessible (air hose) to hit the dual valves mounted at the bumper. I run 1psi for every 100lbs of pin weight added. (trial and error formula with a DRW) So I don't really need to adjust on the fly with an added air kit for the air springs.
However, IF I were to double the install price and add in-cab air adjustment, I'd go for the AirLift wireless system, with no need to penetrate the cab.
Caution on that though, when not in use for long periods, remove the batteries from the remote, lest you don't have power when you DO need it (eats battery on standby duty).