Muay Thai kickboxing is best for someone in the heavy weight category for training speed, power and endurance. For extremely heavy body types, Greek Pakration or Russian Sambo are best. For extraordinarily large bodies, Japanese Sumo Wrestling.
It is Majest Martial Art.
Chinese martial arts
karate, in my opinion
karate.
No martial art is the best. Only those who can master it can be better then another person. Even karate history comes from Chinese martial art.
hit and run
Martial art is only one, and the methods are different, the martial art is by essence self-defense, so if your method of applying the techniques is effective then your style is the best in self-defense. You can visit my Youtube channel for self-defense videos @elmolishow
Kung fu is my opinion but the "best" is a matter of opinion.
Traditional Kung fu
the best chinese martial art in my opinion is wing chun kung fu and the best martial arts teacher of this style would either be ip man or sum nung
Aikido, the Art of Peace, Love, and Connection
The best place to find videos that demonstrate martial art systema is YouTube. Simply type "martial art systema" in YouTube's search bar, and several pages will come up on that subject.