We have to turn our attention to who would survive in Darwinian-theory. If Superman were smart, he would team up with Batman/Bruce Wayne with all his financial resources to buy up the kryptonite and put it into some container in which the kryptonite's radiation could not affect Superman (and in the movies, I seem to remember kryptonite being merely covered with a cloth, to which it had no effect on Superman...only when the cloth was pulled away, he cowered in pain.
Strictly Liable,Superman is not the best superhero because he is basically impervious to enemy attack. Batman is vulnerable; as you said, he is just a rich guy in tights. Batman lives life on the edge. He is also the charismatic leader of Wayne Enterprises.
We haven't established criteria for 'best' here. If we're talking about whom could take who in a fight, I think the Dark Knight Returns series established pretty firmly that Batman could take Superman in a fair fight, even if Batman was old and out of shape. That's because Batman is awesome. If we're talking about which superhero has had the greatest cultural impact, Superman certainly gets some more cred.Patrick Bateman from American Psycho? He didn't wear tights.-Ty
How does Batman getting close to winning a fight against Supes after he has Green Arrow shoot Supes with a Kryptonite arrow constitute a 'fair fight'?