The main things for me are the dedicated D-pad and dual thumbsticks. On the original, the left touchpad surface was just sort of textured to help it act as a D-pad. And the right touchpad is positioned in place of where you might want a right stick to be, and can be mapped to act as one in software. But in practice, there are some situations in which an actual D-pad or actual right stick are much better than faking it with touchpads. The new controller just has all the different input methods so that it should hypothetically work great in any game.