I would like to freeze time, because that would be frikkin sweet. As a hero, id be 50/50. i would do heroic things, but also bad things, like if i wanted money from a bank robbery or to hurt somebody..... ya.
Example, I stop a bunch of bank robbers, but i keep the money.
Freeze time would svck because then you would age faster than everyone else. Think about it when you freeze time you still age while everyone else is frozen, eventually that would add up and you would age faster than everyone.