My opinion:
KH1 had a better emotional attachment to the characters and the bosses were difficult.
KH2 had better graphics, the reaction system, open boxes IN battle (my pet peeve with KH1), and the explanation of a Nobody has completely changed the game.
Because emotional attachment is highly rated in my book, I'd say the two games are equal, but for different reasons.
KH1 had a better emotional attachment to the characters and the bosses were difficult.
KH2 had better graphics, the reaction system, open boxes IN battle (my pet peeve with KH1), and the explanation of a Nobody has completely changed the game.
Because emotional attachment is highly rated in my book, I'd say the two games are equal, but for different reasons.