Opening - Seifer
Delling - Squall (Unless you lost)
Galbadia - About even it's 3 on 1 so we cant really tell
Galbadia with Edea - Well Seifer's weakened. So i guess technically Squall is better
Lunatic Pandora - 3 on 1 again.

So its really hard to tell who's better, but chances are they wouldnt make a game where the rival is stronger than the main character despite how much cooler the rival is ,that barely ever happens. Theyre usually tied