The only difference between all of these holos is the base color. They all have an amazing holo effect and glow outdoors and indoors. The silver (61) is the most blingy of them all. So if you are going to purchase any of them I would pick 61 and then a color that you like for another. I really don't think anyone needs them all *cough* but they really are wonderful holos. I buy my Nfu-Oh polishes from Fabuloustreet.