Our CC has the HWH air leveling system only, no jacks. I've tried it both ways.... first dump air to let the suspension lower, then activate the air leveling, or just start the air leveling while the coach is still at ride height.
Bottom line, I don't seem much difference between the two in terms of where the coach ends up but dumping air first seems to prolong the process.
As far as movement, I don't see much difference in normal use from that of our previous coach with hydraulic jacks. Now recently we were parked with sustained 40 mph winds hitting the coach broadside, with 60 mph gusts. It shook the coach. Only time I wish I had jacks to provide some additional stability.