Superman for a number of reasons why. He is the first official tights wearing cape donning superhero before the copycats came. He possesses super strength and invulnerability which became a staple foe many other superheroes. His heat vision is imitated by many fictional characters such as Cyclops. His flight is also a reoccurring power of superheroes. And many more. He is in many ways father of metahumans and supers. If it wasn't for Superman, Batman would not look as cool.
WHERE ARE THE OTHER DRUGS GOING!!!!
He is the better american symbol. Superman is an illegal immigrant... XD. Batman is a perfect example for america. Having so much power, but doesn't use huge weapons (batman doesn't use guns), doesn't murder, attacks criminals, trust's nobody, independent, and rich. America should be like him.