I've never used those two but I have used the old school Kool-Bloom from GH, it works pretty well and is very simple but have since moved on to the Fox Farms series. I like the Beastie Blooms and Cha-Ching combo. They have a third one called Open Sesame that is supposed to go with it but I was having problems with it causing nose dives so I cut it out.
I hear good things about Advanced brand bloom stuff.