1) Eliminate Vibrations
One crucial factor of a grip is that it is meant to shield your hands from unwanted bat vibrations. This will reduce the chance of you experiencing sting when you are playing in cold weather or have made contact with an inside pitch.
The grip of your bat can play a huge part in whether or not the bat feels right in your hands. If your grip does not feel comfortable, then you are most likely not going to feel comfortable at the plate.
3) Loose Hands
Having a grip that allows you to have loose, quick hands at the plate is a necessity. Having loose hands is big contributor to getting your bat in the strike zone, fast. When testing out the grip of a bat, make sure your hands are comfortable and cling appropriately to the bat, but make sure the grip tape is not too sticky, so your hands can have a conforming yet loose hold on the bat.