Milton Friedman won debates on cheerfulness and confidence rather than on argument, and Ayn Rand lost them because disagreement made her angry.

Milton Friedman, he also does tend to have friends who agree with him, yet he's always willing to debate his opponents, and he's willing to do so with a smile on his face. He's a happy warrior, and he actually will win a lot of debates simply by his emotional affect and his cheerfulness and his confidence, where Rand will lose debates because she gets so angry in the face of disagreement.