The MX Master 4 is one of the best mice we've reviewed, but so is its still-for-sale predecessor. We pit them against each other to help you decide which is better. Design and Build Quality With a curvaceous shape that fits perfectly in small and large hands alike, the MX Master 3S offers ample comfort. An additional scroll wheel and row of buttons are easily accessible on the left side of the mouse, as well as a slight wing that perfectly supports …| PCMag UK