You have to remember that "bubbleponics" is just a commercial term, like ipod, not a category like mp3 player. What is called bubbleponics is just another variation on DWC. Instead of the drip from the top (conveniently powered by gravity), it puts the feeder tubes in the res and adds a submerged pump and a distributor. Some of us maintain that you can do every bit as well by relying soley on intense bubble action and skip all that appartus in the water. Ironically, "that" would be the real bubbleponics.
I think the bottom line is they all work and any difference in performance is mainly a function of the grower not the system. Ebb and flow is really a DWC variation, too. You just have to learn exactly how they work and ask yourself if each one of the parts you are being told you need, is there because it does something critical for your plants or if it is there because perceived need creates a market for something someone is selling.