Peace Corps vs. Teach for America?

Upon graduation, if I had to make a choice, I would opt for the Peace Corps as opposed to Teach for America. While both are notable causes, I would welcome the opportunity to make a difference outside of the United States. The comparison has been made that even the worst-off individuals in America are better off than the majority of the world's people. Perhaps this is the motivation that would steer me towards international service. The opportunity to help the poor and the impoverished outside of the US would be another draw for me. Having participated in a home-building mission in Peru and having reaped the personal benefits of that experience, I would welcome the opportunity to do something like that again.