You must train for hand to hand combat.
Even if you are carrying a gun, the attacker is not going to stand there
waiting for you to get your gun.
You must train to be in a state of MUSHIN (pronounced moo-sheen)
which means instantaneous reaction without thought.
Is there a "best" training? I believe as early and young as possible
one should get involved in many martial arts. Wrestling, boxing, etc.
Usually one gets some training if in the military.
But there is no training as good as experience.
Go to a college town. Preferably where there are also a lot of cowboys,
oil field workers, biker gangs, (you get the idea).
Then find the wildest nightclub you can and get a job as a bouncer.
After 3 or 4 years of getting "involved" every weekend, you will
start to reach that state of "mushin".

I was in line at a McDonalds and some guy started yapping at me,
with some threatening words, about cutting in line. He invited me
outside. I very calmly told his wife to call 911 and ask for an
ambulance, and told her he was going to need it. She grabbed him
by the arm and drug him out. (I think he was on something).

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In Omnia Paratus