There is no ultimate martial art or invincible method, all living things eventually die. Budo is to nurture and protect life.
Choose a martial art by following your instinct. My teacher once said that it is better to spend 10 years looking for a good teacher than 10 years training with one who is no good.
If budo is for human survival, then surely it should strike something deep within those who experience it, whether they are practitioners or not. There are no juniors or seniors in my dojo, the only status is that of martial artist. Our training group welcomes those who enjoy a challenge. Good hearted people are needed to continue to preserve our warrior traditions.
The Bujinkan evolved to become a cultural asset of Japan, now it has become a treasure for all humanity.