Blue eyes on girls are my favorite, but the color doesn't make a big difference on how I rate or see the girl. As long as the shape and look of her eyes are beautiful, color doesn't make a big difference to me.
I like really vibrant brown eyes. Doesn't really matter a whole lot to me though. I wish my eyes where a bit brighter, if they aren't in a brightish area, they look almost black, but when the sun is shining on them, I am told they are very pretty. I wouldn't know though. I asked my friend to take a picture of them. http://postimg.org/image/4te2884yn/02bf5d74/
I love green eyes but I'm a huge sucker for blue. I'm not a fan of brown eyes but it's not like I look at a person and decide whether or not I like them based on their eyes! :P Hazel's nice. But yeah, green or blue.
No color is a deal breaker, of course. It's not THAT important to me, haha! But I do tend to love the lighter/brighter blues and greens the most. Especially when they have dark hair, it makes their eyes POP... very sexy.
I'd say those blue eyes, especially if he's got dark hair. But i think green is really attractive as well. (: To me brown eyes are cute because they remind me of a puppy's eyes. But yea, Blue would have to be my favorite. Unoriginal, i know. Haha