This is a tough, and interesting sort of question.
I'd look at it purely from the perspective of personal sacrifice, and say that it was braver for humans to give up their lives. I don't think the book gives us specific clues as to whether or not one race was braver than the other. I'd say that the act of willingly giving one's life is a bigger deal for a human, from what I understand.
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~The beginning is the word and the end is silence. And in between are all the stories. This is one of mine~
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