i'd use either one for hydro lookin at others grow journals. GH maxi series is designed for soil. but it is chems.
I used GH maxi bloom for soil before worked well. but since switched to 100% organic. Not a single chem in my soil. Really only use Fox Farms Big Bloom (organic) in my organic teas for an added kick.
IMO, and maybe only mine...AN is overrated and overpriced. I've heard it works great but there are others atleast as good for much cheaper(simpler too!), like GH.