You know actually the perfect answer is to choose ONE company. Buy the nutes YOU want to use. And follow the directions on the label only ammending for common sense.
(Hmm this plant is 2 inches and has its first actual leaves, maybe I should feed it with the amount of nutrients specified for vigorous growth of a FULL GROWN plant)
Do things that make sense after you have thought about them thoroughly for 24 hours and double checked on here.