I can't really compare, because I can't really think of a sibling team where one is noticably smarter than the other. My mom is the third youngest of seven. The youngest lives in Hawaii and the oldest lived in Minnesota -- so who is smartest there?

Seriously though, take myself and my brother. My brother is two years older than me, but I did better than him in school. He did a lot better than me socially, though. But again, he's only my half brother, and we didn't always live together, so those environmental factors of older and younger sibling may not apply to us.
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