LOL, it would have both, ideally. But as for how the GamePad would improve the original stylus controls, try holding the GamePad in your lap, resting it on your lap, and see how naturally your fingers melt into the plush shoulder triggers, how much space you have to draw on the larger touchscreen, etc. It's just more ergonomically correct, and I suspect many people who couldn't handle stylus controls before would find them more bearable on WiiU.
But of course, there should be a Wii remote pointer/nunchuk option, as well.