If you're into scene girls or gothic girls then definitely go for long flippy hair cause my friends that are gothic love that and don't like short hair. But I on the other hand like shorter hair that is spiked in the front or if not spiked comes down to mid forehead in length and is kinda messy but presentable :)
It really depends on the girl and their personal own preference. Based on what I see from boy bands girls like messy/neat hair. Like you just woke up, but it looks like you played with your hair in the mirror a little.