For a very weak and relative definition of "best".

But seriously, I'm curious. I just learned the HD Remixes include all the games except 3D, for the first time on a single console. That is actually very nice of Squeenix, thank you very much Square-Enix.

Also Roxas' game isn't even a game anymore but just a movie you can watch? I might look into that. I've always liked Roxas.

Also i chose the term "Writing" because I didn't want to specify "Story." Some people are very nitpicky about that. A game with a great story might have awful characters and vice versa. One KH game might have a decent plot while another game has better characters.