This inquiry should really be made in the subtopic area meant for bubbleponics and DWC.
Actually the difference is in that bubbleponics has a lower water level that allows for the system to basically be a aeroponic system with the lower part of the roots sitting in water like aquaculture ststem in Pot culture called an DWC system. They are both highly dependent on artifically high DO provided by aeration and air pump(s) and therefore are really bunk systems cobbed together systems. They do work though, but have many problems at higher degrees than true aero or inert hydro systems.
IMHO their only true good feature is they are cheap. I am sure , however, in the sub section they are well thought of.