i think the real problem is people think they need to buy every product in the line, thats when it becomes really expensive.
funny bashing the GH line, when its been used to grow dank for decades. its salty for sure, but still a good line with everything you need to grow good buds, even without boosters.
its basically your application of the nutes and your environment is 100 times more important than what brand of nutes you use.
i was using kool bloom, then i switched to hammerhead/
MOAB. i liked the results so i continue to use it....who knows though, i have another 2-3 crops under my belt, so maybe im just becoming a better grower.
the only REAL way to test which one is better is to run a side by side, same strain in the same room, same veg, etc.
also, not sure about the ph proof line...if its always at 6.1, then arent some of nutrients not being used efficiently? i like to have a little swing so everything has a chance to get taken up by the plants.
if you arent buying at least gallon bottles, you need to rethink what youre doing. its like 1/3-1/2 of the rate if you buy in bulk on some of these products.