Agawi conducted a touch screen comparative test to determine with device's screen was the most responsive and the big winner is the Apple iPad mini at 75 milliseconds.

The next best device is the iPad (4th generation) at 81 milliseconds. The third best device is the NVIDIA shield at 92 milliseconds. 

Why is responsiveness important, it is the speed at which the device reacts to your masterful commands and makes handwriting on a tablet much more usable.