It's a subjective topic... I'm using Magic Mouse nearly since it was released, and recently I tried a colleague's Logitech MX 2 Master for only a day, and the next 3 days I had really bad wrist pain. (It wasn't some tingling, it was really bad carpal tunnel pain) So in that terms, Logitech MX Master is an ergonomic disaster, for me.
It's a subjective topic... I'm using Magic Mouse nearly since it was released, and recently I tried a colleague's Logitech MX 2 Master for only a day, and the next 3 days I had really bad wrist pain. (It wasn't some tingling, it was really bad carpal tunnel pain) So in that terms, Logitech MX Master is an ergonomic disaster, for me.