Superman vs. Captain Marvel - Round 1
In a strange twist of business fate, in the 1970s, DC Comics acquired the rights to Fawcett Comics competing character, Captain Marvel. Captain Marvel was almost as old as Superman, and at some times and in much of the world outside the U.S., more popular than DC's #1 brand name hero.
So, inevitably, the age old question was renewed - who's stronger? Shazam (AKA Captain Marvel), or Superman? Writer Elliot Maggin decided to put the two head-to-head (using a pseudonym for Captain Marvel - 'Captain Thunder' by editorial decree).
While (as you might expect), when the dust settles, the central question is left pretty ambiguous. And that's O.K., that's not why I feel this story didn't rise above the mere average. It's because along with the usual physics issues that sometimes get glossed over in the comics (beyond those specifically dealing with superpowers, which automatically get a free pass), the story does little to give credible explanations to such things as how Cpt. Thunder got to Metropolis, what and how exactly the Monster League of Evil changed him, and how (beyond some verbal gobbledegook) Cpt. Thunder knew to fix things.
Still, like much of the Bronze Age comics, it is a fast paced story with lots of action, and great art by the great Curt Swan, so while it doesn't rise to the heights it aspires, neither does it fall too far below them.
Worth checking out to see the two Big Cheeses duke it out.