In terms of pure power and strength Superman is. However if you are talking about who is the coolest, has the best villianns, etc. then I'd say Batman. Batman is my favorite superhero so I am kinda skewed but Batman is just freaking awesome. He has a weapon to kill almost all the superheros he meets because of how paranoid he is. He is the richest superhero and one of the smartest. He also has lots of great villians such as The Joker, Mr. Freeze, Zsaz, Poison Ivy, and many others. Most of Superman's villians are just big guys with super strength; not as much variety as Batman. Batman also killed Darkseid who is one of the most powerful villians in the DC universe!