See here's the thing. They both have morals. And Batman is "The World's Greatest Detective" It has been shown both in the comics and the animated movies that Batman has a contingency plan for every Justice League member. Which is very effective, to the point of someone stealing his plans and taking out everyone based off those plans. However, if Superman were to put those morals aside. And use his powers to his fullest. No doubt, he could be the ultimate badass. Example of him even pretending to let go. Superman Vs the Elite. https://www.youtube.com/watch?v=egZwhufvfPg