You can us a special stylus on a plain capacitive, but the input is finger sized. You can't get fine control, like with a thin stylus that can fit in your device easily and give you really great precision, for things like drawing or using standard desktop menus that aren't finger sized.

Some notebooks use a combination of capactive touch and active touch screen layers, this is more expensive and one can use a very precise active stylus with the active screen layer. The problem is both cost and size of active stylus. So if you need drawing, or use desktop software unmodified on a small screen the best bang for the buck is resistive touch.