I don't know which is harder. I have two girls - one is 15 (16 in Oct), and the other is 13, and I have a 6 year old boy.
The oldest one fills me with fear every time she walks out the door - I was 16 when I got pregnant with her, so I've been beating it into her head that boys are icky, and I can only hope that she's listening!

My 13 year old makes me crazy. She is soooooooooooo intense.
My son is pretty laid back, and I don't know if that's because he's a boy, or if it's his age. He does have his moments though.......every single day......
So in summary, I am not so sure if it's a boy/ girl thing, or if it's a parenting thing.