Gold, Brown, Bronze
neutral and go well with any look.
Brown is a pretty common color, so it’s not seen as “wow! Such a pretty eye color!” Blue is also fairly common, but an exotic blue color and greens are seen as more eye catching.
In terms of having the widest variety of product to choose from, brown eyes are best. Brown eyes look good with just about any color shadow or liner whereas green or blue eyes can clash with some shades.
Seriously though, are you going to f**k with someone who has purple eyes? I wouldn't...
Blue or grey
there is NO BEST--brown is dominant, blue is recessive, and the others are mixtures.