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i'm going to say Riku's because i always wanted to play him in KH 1, and then when KH 2 came out we still didnt have the chance to play the whole game as him.
I prefered Riku's Story more because it had more interaction with Organization XIII rather than Sora's story. Also the instant reloading was a relief. It was bittersweet that you could not customize the deck though. It took the worry of building a deck off your mind but you were also stuck with the cards that they give you. Battle system is easier and much cooler than Sora's especially the dark mode.
Although i gotta admit.. CoM Pwns all other KH titles
Great Story and Inventive Battle System instead of the normal Button Masher....
CoM is my fave