As the Title says what mouse grip / how do you hold you mouse when gaming?
listed below are some explanations on what the difference is
The Palm Grip
The Claw Grip
The Fingertip Grip
I my self is a Fingertip gamer, as I think it is the most precise and fastest method of moving the mouse and still hit target. ( also mentioned in the link )
also if you feel like it explain why you hold it like you do