36% against post-KH2 Sora (46% against Mega Man) vs. 38% against Tifa
At best it's pretty even.
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BOP Results: http://www.freewebs.com/charmander6000/Rivalry%20BOP.xls
BOP Topic: http://www.gamefaqs.com/boards/8-gamefaqs-contests/60566352