They can market it however they want, but the air suspension (in our trucks) does not compensate for corners in any special manner. The spring rate in a coil is linear (actually the DT's are progressive, so it's actually a little bit parabolic) and the spring rate under compression in an air bag is inversely proportional to the decrease in volume of the bag, so minor bumps and light road forces such as cornering are perceived as smoother, because of the more supple "spring rate" at the middle of the airbags travel, and larger bumps such as speed bumps and potholes can actually feel worse in the air ride trucks due to the excessive "spring rate" under high compression of the bags.
And I've never once been able to hear my air ride compressor from inside the vehicle, even when stopped and playing with the height settings, and especially not when driving. The Ram website mentions decreased body roll in Aero mode due to the lowered right height.
Since the coil trucks don't lower to Aero height and the air trucks do, and, as you say, being at Aero height helps to reduce body roll, it seems fair, to me, to say that air suspension gives the trucks less body roll.
My only experience is my 4th Gen (coil suspension) vs my 5th Gen.
I put Bilstein shocks on my 4th Gen shortly after I bought it. They were leveling shocks in the front and I put spaces in the back to level the truck at the highest setting for the front shocks. So, something like 1.5" - 2" higher than stock.
On the 4th Gen, I thought the Bilsteins improved the ride over stock noticeably. More taut. I.e. less wallowy. But, just as supple/compliant, if not more so. In my mind, that translates to more low speed compression damping, with a little less high speed compression damping. And maybe more rebound damping. But I digress.... The Bilsteins were an improvement over stock coil suspension.
On my new truck, I feel like the air suspension rides as well as my old truck with the Bilsteins. I had actually noticed that my new truck feels like it has less body roll than my old truck before I read anything here about that. I suppose that could be because the new truck sits lower anyway (compared to the small lift on my old truck), and then gets even lower when in Aero mode. It definitely feels less wallowy than my old truck did on stock suspension.
But, I'm not sure how my old truck compared to a 5th Gen on coil suspension.
All that said, the 5th Gen with air suspension rides great. And I have already learned that I really love the ability to hit a button and lower it to Entry/Exit height. It really makes a difference when putting heavy stuff (like scuba tanks) in the back, or taking them out. I believe it will also be a major bonus when I go to load my motorcycle in the back at some point.
