Instead of bouncing around from creatine to creatine, I got fed up with it and finally reverted back to the pure stuff: CreaPure creatine monohydrate. That has been the most effective creatine product that I have used.
CreaPure is micronized creatine monohydrate, purified "to the max" (for a lack of a better term). When I ran it, I took 5g preworkout and 5g postworkout. I usually don't respond to creatine AT ALL, but I did notice size/strength increases when running CreaPure. The price also can't be beat.
My recommendation is to save time, cut the crap, and go straight for the pure goods. If you've already tried CreaPure and want to go a different route, Controlled Labs Green Mag and Con Crete are both highly recommended products on this site. I generally advise staying away from Kre Alkalyn, but others will recommend it, so the only way to figure out if you like it or not is to try it yourself.
Hope this helps