Good vs. Good

Similar to Evil Vs. Evil, but with a hero fighting another hero. It's hard to create a story where both sides are fully sympathetic and yet in a real conflict with each other. But sometimes the authors manage to pull it off. This is not when the characters on both sides are somewhat sympathetic, merely believe in their own actions without being fully sympathetic, or are in a temporary conflict by mistake. No, this is when both sides are unambiguously Good AND locked in a real conflict with each other.