They're all the same, except that you pay a premium for some brands because of marketing. I've seen people get better results with miracle grow than others have with hundreds of pounds worth of advanced nutrients with names like "bud blood overdrive super giant dong". It's bullshit, as long as you are giving them their feed at the right ph and EC the feed is optimal, there are much more important things to spend your money on like good genetics, good lights, good extraction, CO2 etc.