A gaming mouse should match the way your hand rests, not just look comfortable on a desk. Notice whether you naturally grip with your palm, fingertips, or a curled claw shape. A broad, high shell may support a relaxed palm grip, while a lower, narrower body can leave more room for fingertip movement. Neither shape is universally better. Your fingers should reach the buttons without stretching, and the mouse should not press sharply into your palm.
Size matters during longer sessions. With your hand on the mouse, check whether your wrist stays fairly straight and your fingers can move freely. If your fingertips hang far over the front, the mouse may be too short; if your palm feels trapped, it may be too large. Weight is just as personal. A lighter mouse can feel quick during repeated flicks, while a heavier one may feel steadier for careful tracking. Try moving it across your usual desk surface. Small differences show up fast.
A first impression can be misleading. Give a new shape a few short sessions, then notice soreness, grip tension, or missed clicks. I would not treat one measurement as decisive; hand proportions and habits vary. Even a comfortable mouse can feel awkward at first.