What is the Best Defense?

The answer is "a good offense."

Added:

Ones mind is the primary self-defense tool. Use your ability to think, be aware, look, listen, and be familiar with common methods of attack.

I would NOT recommend any defense tool or weapon, lethal or nonlethal, used for self-defense, which you are not familiar with, have practiced with, are prepared to use fully, or understand the legal ramifications for their use.

Remember, which ever weapon you choose for self defense it can be used against you, not dogs usually. A bat can be taken away from you and a gun or knife can be turned against you.