I have gotten really good growth from 2-150 DE MH 10k. I got better color with 2-150 DE MH 20K but not as much growth. I have found a happy medium with the Pheonix 14K and growth and the colors are very good.
It also depends on the type of zoo and how big the colony is. ie..
my PPE grow very slow, four polyps, but my dragon eyes grow at a pretty good clip but the colony is ever 300 polyps so I get alot of new growth every month.
I have never had PC's so I cant comment on them. BOL