Ok, this is a bit of a toughy...
KH1+ Disney worlds wern't rushed and made more sense, Sora was adorable, more things to find ( puppies, trinities, etc. ) Ansem...
KH1- Camera angle
KH+ Riku, the org, forms, dual weilding, deeper story, more original characters, few more original worlds, better camera,
KH2- Disney worlds were rushed, crappy dubbing, easy, Mickey appearing out of no where, not much to do, Chicken Little, crappy summons.
HMM...Uhhh...
KH1 was a better game, but KH2 was better plot...
...f*ck thats hard o_o;
I'll go with KH2 being my fav >>;
I replay that more than 1.