Transformers are the strongest. Let me explain to you that transformers are mechanical creatures living in Cybertron. Their owners have superb wisdom and ability, but they are not artificial. The history of the birth of their planet is much longer than that of the sun. Even if Superman has super powers, he is not invincible. He is afraid of kryptonite, and he will be incompetent when he meets it. Batman is a man, and his weapons are man-made. Transformers are tens of millions of times taller than humans. 1 cannon kills a bunch of human beings, just like Spider-Man and Huluwa! Nothing on earth can defeat Transformers, including Superman.