Bart Simpson vs Stewie Griffin

Description
The Simpsons vs Family Guy, which of these two mischievous young members of the main family will win in a battle to the death?

Rules

 * Despite the fact that they had a crossover episode, Bart and Stewie will have no prior knowledge of each other.
 * Composites of both characters will be used, meaning that Treehouse of Horror will be included.

Interlude
Wiz: Mischief is often regarded as unhealthy, rude and sometimes downright dangerous, they're also regarded as something only young boys would do.

'''Boomstick: But it sure as hell makes us laugh! Like Bart Simpson, the 10-year old member of the Simpsons.'''

Wiz: And Stewie Griffin, the homicidal maniac of the Griffins.

Boomstick: He's Wiz and I'm Boomstick!

Wiz: And it's our job to analyse their weapons, armour and skills to find out who would win a Death Battle.