Logitech MX Master 3S vs MX Master 4

The Logitech MX Master 4 is the successor to the Logitech MX Master 3S. The MX Master 4 introduces subtle shape refinements, including larger click buttons and an expanded palm rest area. It also adds a new side button for gesture controls and a haptic button on the thumb rest, which you can customize in the software to display productivity shortcuts, including supported app-specific options. Also, the soft-touch rubber coating on the older MX Master 3S is replaced with hard textured plastic and dense silicone grips on the thumb rest and right side of the MX Master 4, which should provide better long-term durability.