While both methods work by exfoliating the top layer of dead skin, Hydra-Dermabrasion is a newer technology and considered to be a lot more gentle.
The added benefit of Hydra-Dermabrasion is you can add a cleanser or exfoliating serum into the water mixer, which means you are flushing your skin with ingredients such as AHA's or Hyaluronic Acid for additional benefits!