Taekwondo\ Karate\ Boxing\ Sanshou, which is stronger?

There is no such thing as the most powerful martial art, only the most powerful people. All kinds of moves have its advantages and disadvantages (because the contradiction is the unity of opposites well ~), depends on your reaction speed and the ability to cope with it. Take Taekwondo for example, many people think Taekwondo is trash, but it's not. What they see is just competitive Taekwondo. Because there are many limitations on the rules (e.g. you can only use the front fist and no head shots, you can't attack the limbs or below the hip, etc.), and in competitive matches the goal is to score points, point blank. But the power of combat taekwondo is very big, can do a move to stop the enemy.

So we can't say one-sidedly which is powerful and which is not. The main thing is to see how the rules are in the competition. If you PK sparring with competitive taekwondo and use the rules of taekwondo, then sparring will lose badly. Conversely, Taekwondo would lose. In real combat, it's mostly about how that person applies the techniques they've learned. If Taekwondo uses spinning kicks and flying kicks in a real fight, then the physical strength will be used up very quickly, and it is easy to expose the holes. It is better to use side and back kicks. Only when you are sure to KO the opponent, you can use the back swing or high kick to the head.