Okay well honestly this is all on the type of female...I hate men with long hair they probably spend more time doing their hair then I do...I know too many guys with the shaggy look or long hair that have flat irons...come on men you should not be flat ironing your hair! I love a clean cut man maybe its from military background but I love a man that is clean cut and a short hair style so sexy
The best style would be one that you enjoy, that compliments your facial features.
Research on www.google.com as to "hairstyles for men" and figure out which styles compliment what.
No two people are the same. There is always a chance that a certain hairstyle will "be in" / work for another individual; however, at the moment I recommend understand what would compliment you most so you can make a better decision.