i would say pokemon platinum personally. obviously im a big fan of pokemon (if my name doesnt say it) and pokemon platinum has alot of end game things you can do. as well as the online stuff, its all in all a game you can put alot of hours into. kingdom hearts is fun to play, but you can get bored of it and i dont know what it has for end game activity (my thoughts are probly none) but even if it has ned game multiplayer battles, then its not that personalized. pokemon platinum you at least have over 400 pokemon you can use. my vote is pokemon platinum. (id really say go for heart gold or soul silver over platinum but thats me)