The Aeroclipse has a setting that can change from "breath actuated" mode to "non-actuated" meaning the nebulizer can produce aerosol continuously or only when you take a breath which makes for less aerosol wasted to the air and more to your lungs. Also the Aeroclipse can be used with the Aerobika when nebulizing.
The Pari is just a nebulizer with a flimsy little flap on the mouthpiece that sort of makes it "breath-actuated" and it cannot be used with the Aerobika.