@1:04/Nero just blows Sora's ass out of the orbit with his Devil Bringer.
Been the longest time since I touched KHI or KHII. I only remember that Lion King boss so well because it reminded me of Shadow of the Colossus. Sora's best feats were mostly gameplay, whereas Puss-in-Blue has at least a couple of decent out-of-game feats. Goody-two-shoes Dante-wannabe has already faced at least as bad as what Sora can dish out magic-wise, at least individually though I think it goes without saying that his best feats are usually due to his sucker-punch machine of a plot-based explanation for hammerspace.
I'd opt either for a tie, or for a close-ish win by the prettyboy who (litreally) cried "Kyrie".