Avengers vs Justice League Exposed Marvel & DC's Different Philosophies

screenrant.com:

While the Marvel Comics and DC Comics universes may appear similar, a small but key difference points out just how far the two diverge — and the Justice League vs. Avengers crossover proves it. Released in 2003, the long-awaited crossover (in the works since the 80s) pit Captain America, Thor, Iron Man and other Marvel superheroes against Superman, Wonder Woman, Batman and the rest of the DC pantheon. The fan-favorite JLA/Avengers crossover wasn't afraid to point out the major flaws in each hero's world — and in both companies as well.

The very first Marvel/DC crossover, Superman vs. The Amazing Spider-Man, was released in the 70s and sold well enough to prove the concept was worth investigating further. A Batman/Hulk crossover only cemented the idea in executives' heads, and plans to create an epic Justice League/Avengers crossover moved forward. Unfortunately, difficulties in communication combined with the companies' different work styles resulted in multiple delays, concluding with the book's cancellation. 1996 would bring Marvel vs. DC — a multi-company crossover, but not the adventure the writers intended.

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While the 1996 crossover forced fights between characters (Hulk and Superman fought simply because they were teleported to the Grand Canyon, for example), 2003's JLA/Avengers actually showcases a true ideological difference between the teams. When the Justice League find themselves in the Marvel Universe, they are shocked at state of the world; dictatorships like Doctor Doom's Latveria and poor nations like Genosha are seemingly without help. Superman in particular is incensed, wondering why the Avengers aren't doing their job — especially