When comparing Kensington Expert Mouse vs Logitech G Pro Gaming Mouse, the Slant community recommends Logitech G Pro Gaming Mouse for most people. In the question“What is the best gaming mouse?” Logitech G Pro Gaming Mouse is ranked 35th while Kensington Expert Mouse is ranked 55th. The most important reason people chose Logitech G Pro Gaming Mouse is:
It has the PMW3366 optical sensor, which is considered to be one of the best sensors out there. Its accurate and has no jitter at reasonable DPI. No smoothing, filtering or acceleration - the mouse is extremely accurate and reliable.
Specs
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Pros

Pro Comfortable and ergonomic
With thumb and pinky on the buttons and three fingers controlling the ball, the user's wrist lays flat on the table (or on the provided attachable wrist rest).

Pro Intuitive link between ball motion and FPS camera angle
The ball is large enough for turning it to feel like physically rotating an object.
Pro Very accurate
It has the PMW3366 optical sensor, which is considered to be one of the best sensors out there. Its accurate and has no jitter at reasonable DPI. No smoothing, filtering or acceleration - the mouse is extremely accurate and reliable.
Pro Software with lots of options
The software has a lot of options like lighting color changing, button customization, heatmapping your usage and much more.
Pro Great speed
Speed of 300 ips makes sure the mouse will track even the fastest movements, when turning around in-game to shoot an enemy behind you.
Cons
Con Not a mouse
This is a trackball, not a mouse.

Con Questionable secondary button defaults
The upper left button, which is the hardest to use, is middle click by default. The upper right, which the ring finger naturally rests near, defaults to Back. This can be particularly annoying as the Back button is easy to brush when moving hands between keyboard and mouse.
Con Designed for smaller hands
It is designed for smaller hands so it might not be comfortable for everyone.
