It may vary in different people due to difference in taste. I think you should however stay away from the white and black colors as your nail polish. There are those that prefer no nail polish at all. Just to be safe use a neutral color like clear polish or a pale shade of pink.
Guys don't really care about nail polish colors. All guys are different. All girls are different. There is no one favorite for anything. Wear what you like that compliments your personal coloring and your clothes.
Nail polish is very telling. Red nail polish for example is worn by more traditional women. When I go on a date and the girl is wearing red nail polish, I know she is trying to send the message that she wants a long term romance. Shades of pink imply warmth towards that kind of thing, but are more reserved. Girls with colorful swirls and polka dots are usually headcases who are desperate to present a sense of style. They usually don't have very good jobs and require a lot of emotional support. However, they are likelier to jump into bed because stimulation relieves them of their emotional criseses. Subtle blues or greens or solid spring time colors usually tell me that the girls mind is not on romance necesarilly, and usually it implies a degree of maturity. If its too bright the girl thinks too much of herself. The absence of nail polish is either the sign of someone more concerned with practical affairs and doesn't have time for it, or of someone who is a feminist who has risen above their gender. Date her if you have a small weiner and you like to be told what to do all the time. Although this type of psychopath can be very sexually seductive.