doesn`t sora have the stop spell? sora can just stop aang from moving then transform to final form and just slash him with the keyblades.plus sora has the ultima weapon the strongest keyblade in the game and another thing is that sora has spells like reflect which means if aang uses his bending it wont take any damage to sora.one more thing is that if aang is attacked on the avatar state then aang will be killed sora could simply slice aang with his ultima weapon while in his final form.so sora wins and aang loses.