Azula
Father was attempting to burn down and mass murder an entire nation. It was either take Father's life or apparently take his bending and Aang is a Air Nomad. They don't believe in taking lives. Trust me, Sokka and myself tried to convince him that killing Father was the only way to stop him. Aang refused vehemently.
Everything was handed to you Azula just because you were a firebending prodigy and never had to work for anything. You were lucky.
You aren't the best of us Azula. More adept maybe, but not the best. There's always room for improvement in things.