Note that "palm rejection" and drawing or pixel "precision" are not decided by the pen model, but the hardware and software of the digitiser in the phone, tablet or other host device. The digitizer resolution should be at least twice the display resolution to avoid jiggling, but the tablet maker never tells what that is.
Pressure steps (512, 1024, 4096 etc) is irrelevant if the Pen is compatible and works properly.
Tilt and orientation are functions of the protocol used. Even if supported almost nothing uses it.
The only important thing is that it's a compatible system.
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