The best superpower to have would be invulnerability
You will be able to save others. If they are going to get shot you can go in front of the person and they will not die. You can put others first and not risk your own life to save others.
If you get shot you won't die and you will live for ever. You can become the super cop to stop all the crime in the world. You won't die die and save everyone from crime with no risk of death.
You can be immortal and will never die no matter what happens. You can take a wound without feeling anything and won't die from getting stabbed in the head or heart.

