Whereas avengers are the good megafunded American plutocrats.

The Marvel Heroes are always pitched as the Underdogs. So, at best, you’ve got a Rogue Billionaire against The World. Or perhaps a Global SuperSpy Network that’s riddled with enemy operatives which needs an even Super-ier Double-Secret Spy Network doing counterintelligence to root out the Fifth Columnists.

Canonically aren’t the two teams both good western lapdogs whose aims seem to often align with the US military?

They’re two sides of the neoliberal coin - the libertarian-leaning advocates for unregulated laisse-faire benevolent SuperHeroing versus the technocratic micromanagers who want a Rules Based International Order managed out of a floating CIA sky fortress. But this is a world in which the US Military is vestigial. Its “The Boys” done unironically, with Superheroes acting as Mega-Operatives who single-handedly do what JSOC needs whole companies to attempt.

I wouldn’t even really call them pro-military so much as ultra-nationalist. Both sides are operating in the (perceived) interest of their Western Homelands, with the implicit endorsement of national governments that only exist to flail helplessly in the shadow of these Ubermensch.

All they ever seem to do is make even larger and larger weapons.

I always thought they were the weapons. They’ll do Goku-tier shit where they execute a mid-movie training montage that justifies how they lose in Scene 1 but win in Scene 3.