I am currently doing both ebb and flow and DWC. I am having a little trouble with DWC as my moms roots are turning a little brown but growing very very fast. Ebb and flow I think is the safest because your plants are not in the water as much so the water being messed up for a while is not nearly as bad as with DWC where the roots are always in water. I would say DWC is for larger plants longer grows. Ebb and flow is shorter plants, shorter grows, more plants. You just have to decide what you want out of a grow. IF you got a good year where your in one place and you can afford to do a 2 month veg and flower your plants out then go for it with DWC. IF you, like myself, need quicker turn around and dont have the space or time to commit to a single grow I think ebb and flow is better. I'm not saying you can't grow the best weed in the world from ebb and flow, but ask any grower. Bigger plants usually equates to better quality bud, all other things being constant.