Karate, Taekwondo, Aikido, Free Fight, Sanda, which is the most practical, please ask professionals to answer and compare them one by one.

First of all, Taekwondo, I can tell you for sure, never deal with people who are tall and strong or have some basic skills. Its retreat is beautiful quickly, but its lethality is very small and its melee effect is poor. Aikido uses skillful force, which is similar to the three treasures of Russia, but it has few hitting actions and is not suitable for actual combat. The leg attack power of karate is slightly stronger than that of taekwondo, but it also has shortcomings in melee. Sanda has wrestling, but also comprehensive leg skills and boxing.