I think it all depends on what you want to grow in your tank. If it's just softies, leathers, go with PC. But if you are more inclined on sps or clams, then T5 is the way to go. I'm growing lps, clams, sps, very few zoos with my T5 and they love it. Most of my mushrooms has to be moved to a MH tank because it's not responding properly to my lighting...