If you are asking "Which Martial Art is the Best" there is no real answer.
THEY ALL ARE.
Again, it is all about what feels good to you, and how determined you are as well as how scared you are.
I am in the "Arts" now 63 years, and have participated in about everyone of them, and I find them excellent for health, exercise and confidence.
I am also a US Marine Corps Devil Dog, and find that in time of crisis when your life is at stake, it doesn't matter if you are Army, Navy, Air Force, or Marine.
It doesn't matter if you have an M-1 or M-16 or Flame Thrower, or just a K-Bar. You fight like hell for your life and there is no second place nor does history hail those who lose, only the winners.
I have seen self defense books that seem to me that the person was never in a real combat situation or in a street fight.
Everything and anything you can get your hands on, from a super market to a place of work, or home, can be a weapon. You are surrounded by weapons. Guns don't kill. People do.
If what you are afraid of is being mugged, shot, stabbed, raped, or murdered, and you don't think help will arrive in time, carry whatever works, from a clothes pin zip gun to a tazer.
From a pencil to a spray of Lysol.
Make your own weapons from a roll of coins in a handkerchief, to a rolled up newspaper, then fight as if your life depended on it because sometimes,