tl;dr: Java's not all that great for writing the typical gory OpenGL code you need for great performance, while Objective-C's (C's) pretty good at it; also, the

tl;dr: Java's not all that great for writing the typical gory OpenGL code you need for great performance, while Objective-C's (C's) pretty good at it; also, the iPhone dev environment is pretty good, compared to Android's.