I"m kinda under the notion that the FF and other soils/nutes are defato standards. Not saying they are bad, but the 'other leading brands' probably aren't far behind with a little TLC.
With that said....
I'm using FF Ocean and MG moisture control. (not together, but different plants) So far it seems good, but not making clone x grow faster then clone Y in the MG. (maybe I've been lucky)
I also add in more perlite and a pinch of vermiculite to the FF soil. Just by feel.
(perlite and a little blood meal to the MG)