Everything has the almost the same stuff in it in varying amounts. General Hydro is expensive because they use more expensive/less salty types (more nitrate nitrogen and less urea nitrogen).
I got a peek at the AN price sheet. Wholesale for bloom A or B is under $20 a gallon. That's half the price you pay retail. Also, notice how AN keeps changing their formula. That just shows how little it all matters as long as the plants are getting enough of what they need. And their Bud Candy or Big Bud is exactly what the label says they are, just more magnesium,calcium, sulfur, or other.
Best thing is to keep the plants green till the last few weeks which means enough Nitrogen and then plenty of PK Calcium, Magnesium, Sulfur, and other minor elements. Nothing Voodoo there, sorry.