KI is the original park, KD is the copy. KI is much, much nicer then KD in my opinion. The locals really love the place, and it has the Beast (world's longest wooden coaster a 5 minute coaster ride...
As much as I enjoy KD, the Busch Gardens park there is my favorite park that isnt in Orlando by far. It has Disneyesque themeing and shows (European theme)...