Its true that the green are VERY bright, ( OK they run at a higher power than the red - the voltage being higher for the same 25 mA )
My supplier offered me 20 odd candela cheaper than the weaker red ones, but for some reason people want red !
OK I can't use blue on outdoor displays or the emergency services would complain, but both green and blue are much brighter.
The white ones 30 degrees are now 26,000 mcd.
The other consideration is that I need 1680 LEDs for this project, and I still have 1720 in stock !