What's with this long hair preference? What is it that you find so hot about it?
It frames and highlights the face better. At least in girls it can create a younger appearance, which is often a draw over an older more mature look. With that said some girls can pull off short hair well.
Those basing your choices on Watson's current hair cut alone keep in mind hair can grow back.
Oh come on people, either everyone here is completely devoid of taste or you prefer girls who like they are 12. Wait... *checks average age of users* Disregard that last sentence...
Anyway, for those of you who's 'google-fu' is lacking, here are a few images of each to help you decide:
Meh. Not much for red heads. Even ones with green eyes. Even though that is supposes to be oh-so hawtness.
One the other hand, Watson is blonde. Which is nicer than red. But, you know, she looks like she is 15. So I feel like a dirty old man even looking at her.
So if we had a decent girl that looked her age with darker hair, I'd be all set. Olivia Munn, anybody?