I actually powered through an entire thread about this subject yesterday on nanoreef called LED Aesthetics. Its mostly for non-dimmable setups where you can't adjust the colors so getting the right balance of led colors are more important. Basically the other colors (Cyan, Red, True Violet) can make certain corals pop, but have to be run at lower power on a dimmer so they dont overwhelm the rest of the tanks color. Also if these colors aren't spaced correctly it can produce a disco ball effect in the tank or leave colored shadows.
Neutral White however appears to blend well with royal blue (3RB:1NW ratio) and leave a warmer color in the tank that isn't overpowered by the royal blue. There are lots of comments that the cool white are too blue for many people although its seems there are many tanks running fine with cool white royal blue combos. It can also depend on the bin number of your leds as two different bin numbers can produce very different colors or temperatures of white so they recommend test building your setup on small scale to determine if you like the color first and then make changes from there. That was just my take on it but there is lots of experimenting with colors and interesting ideas to read on.
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