The reason why digital drawing feels as natural as it does nowadays is due to the pressure sensitivity of the pen. Pressure sensitivity is measured in levels and indicates how closely the stylus emulates the characteristics of real-life media. The more levels, the better.
If you’re a beginner, then 2,048 levels of pressure sensitivity on the lower end are probably perfectly fine. If you’re working on a professional level, however, you may want to have better pen responsiveness.
All recent Cintiq tablets feature the best pressure sensitivity levels currently available. Both the regular Cintiq and the Cintiq Pro line come with the Wacom Pro Pen 2 that supports 8,192 levels of pressure and 60 degrees of tilt recognition.
The latest Cintiq Pro 17, 22 and 27 include the Pro Pen 3, which mainly differs to its predecessor in terms of customization options. Contrary to Wacom’s 2nd generation stylus, the Pro Pen 3 comes with accessories that allow you to adjust it in weight, thickness, and center of gravity.