No comparison to a touchscreen
If you take all the input methods not intended for text input...
1) mouse
2) trackpad
3) wacom tablet (which is a pen, but separated from the screen's surface)
4) finger control
5) all the many other methods which are out there but receive little usage
Compare them to a true touchscreen (either capacitive or resistive) and in all honesty, the touchscreen naturally wins, hands-down. The touchscreen must win because it is based on our natural usage of our hands and fingers. All of the other input methods are designed and engineered as a means of having our body communicate with the computer. Yes, the touchscreen is also an engineered interface but it removes the 'middle man' from the interaction between body and machine. It goes directly to the heart of the matter.
