Personally, I believe the Fiji variant tends to be the brightest of the bunch but I agree with the rest of what you've stated.
I currently have a small colony from Fiji that I've had for about 5 years now (got it shortly before the ban). I actually cut it from rock that it's parent colony was on. It was about the size of a pencil eraser at the time and is now maybe 5" wide. Although generally a slow grower, I'm embarrassed to admit that the tank was severely neglected up until about a year or so ago. Otherwise I have no doubt that it would be far bigger than it is today.