People say DC, but that is mainly because DC's main focus is on characters that are all very powerful, while Marvel's main focus is their street levelers. But if you ask me, it seems like Marvel is overpowered. I mean, it took Superman, MM, and Wonder Woman's combined strength to move the earth. Meanwhile, Hulk has potential for limitless strength, Thor I believe has been shown to move planets, Gladiator can crush planets with just his fists at full confidence, SS can manipulate time to even stopping as well as manipulating the matter that composes everything, Sentry being stated to have no weaknesses, and his molecular manipulation powers have proven to best post-retcon mm, who is powerful in his own right. In his pre-retcon form, he could manipulate all matter and energy. The beyonder I believe has also been shown to be omnipotent, with LT not far behind. And I have heard several claims that Marvel's cosmic beings greatly outnumber DC's.