I like both places well enough, but I feel more inclined to participate here due to the size and closer community feel. I will admit though, due to the size, sometimes questions go unanswered, at which point I will post it on RC. I would say that I personally use RC if I want to find out something where I need lots of opinions (say, the best way to setup a refugium). If I want to trade corals and talk about other more everyday reef topics, I do that here. Also, premium members here are treated very well with giveaways and premium selling areas....at RC, you get to actually search the forums if you are a premium member.