Just to throw a spanner in the works, there is also Organic Hydroponics, but I have not seen any of the nutes here in SA.
I am a organic soil grower, but I can tell from some experiences abroad that I think it is very much up to the grower, and his or her available nutes + knowledge.
Some of the dopest dope I ever smoked was hydroponically grown, and also some of the dopest dope I ever smoked was good ol soil grown.
I think the flush is what really makes a hydroponic smoke match up to a soil grow, with that said I'm horrible at hydro, will give it another go when we get some organic lines in SA.
Awesome thread OP, stay blazd up 420SA!