Now I usually don't say anything and don't take me as being an expert. I had both, The coris was a great fish, when a typhoon came though I had to drain my 100 gallon tank and left nothing but 2 inches of water in it for three days with no pumps or air stone. "there was no electricity." he stayed under the sand the whole time, came out later when I put water back in the tank, great fish, he was store bought, the Lunare I caught, he was more aggresive, but with equal food they both got along fine. The coris was better looking to me. so my tank is a 100 gallon's, and both lived fine, I let them go into the ocean, for room to catch other fish.. Well good luck with your choice...