Gotta go w/ either House & Garden and DutchMasters. Those are 2 top quality products that have unbelievable cutomer service and products to back it. And then to top it off clean and pure. So the systems that you run w/ them aren't getting clogged or have some salt build up you cant see. Dont get me wrong I've got an arsenal of ohter nute companies in my cabinets. but those are 2 that I just cant choose between. I am running H&G in my System. But my mothers(soil) and DWC system get The dutch right now. You cant use H&G's Aquaflakes w/ DWC so thats where that works out. So At least I get the best of both worlds.
Butcher, a good friend of ours uses H&G and swears by them as well. So much so, that it is his front line Nutrients in his hydro shop. He recommends that above all else.