Like night and day. I actually liked the Gen's ride for the most part, though some concrete streets were rough. The Equus exhibits none of the harshness, or at worst, the harshness is greatly diminished.
I don't know if that's due to the air suspension, increased weight (400lbs?), different tires, or a combo platter of all.
As for changing it, the manual is very vague on the matter. It says to use 'sport' on twisty-windy roads or at highway speeds. I understand the twisty roads, but don't know why I'd want to do that on the highway.
Ride height is so vague that I called Hyundai for an explanation: it says to raise the vehicle on 'rough' roads, and that the suspension will lower automatically at 100 MPH. It adds that "low" can't be selected manually (though high and normal can be). Hyundai is 'researching' the question and will get back to me...
Bottom line, it is a totally different experience so far (all good).
Oh: if you do test one, bring a tire gauge with you. If they're above 30 they're overinflated and won't give you the true picture.