Boys: Hell as kids, pretty reasonable at an older age, as long as they're not with the wrong crowd.
Girls: Angels while young, drama queens once they get older.
Talking about middle school/high school level, of course. College+ both sexes should be more mature. It all comes down to: Would you rather deal with stress right after child birth (boys) or have a ticking stress-bomb once they get older (girls), from what I've seen.
Sidenote: Yay finished new desktop!