Cloud vs. Sephiroth
Crono vs. Lavos
Crono's da man, but his rival isn't very good, and Cloud/Seph is one of those rivalries that's just MAN.
Squall vs. Seifer
Sora vs. Riku
I simply have more playtime with Sora/Riku than anyone else in this division. I can also admit being a fan sorry sorry sorry
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Yoblazer: http://oi53.tinypic.com/2hd0dh1.jpg
Watch and you'll see... someday I'll be... part of your world!