it doesnt really matter really, i think they all have things to offer the plants, every site tries to sell theres, so they will tell you it has some miracle ingredients that do this that and the other,

i use ionic myself, ive tried a few out and these suit my needs, because its a one part for grown and bloom, some nutes you have to add equal amounts of grow a and grow b to get the same thing, which can be a proper pain in the ass.

I also like ionic because they do a hard water formulation which means you can use water straight out the tap and it will break it down and drop the ph for you