Those sound like decent results. How long had you been using the reef chili until your zoa colonies doubled?
It couldn't have been much over a month, two at most. They are still growing strong. For example, I picked up a small rock with 9 small zoos on it and now there are somewhere around 30 (hard to count them). Growth explosion started at about the same time that I started using the reef chili.
I also just received some free samples of Coral Frenzy and have been using it since the beginning of this month. It is hard to judge any growth differences between the 'Frenzy and the 'Chili, but the corals and the other inverts seem to like the 'Frenzy at least as well as the 'Chili.
Personally, I would probably buy whichever is cheaper, and maybe switch from one to the other when I run out. As far as I can tell, they are both good products.
BTW, I target feed with the little squeeze bottle that comes with the Reef Chili when you buy 3 jars. Works great.