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Who wins

Based of implied power? Heimdall I'd say, though Spidey has better feats at the moment.

I don't see the point of these threads with people like Heimdall and Thanos. They haven't really done anything noteworthy yet.

Well, Heimdall killed a Dark Elf ship, using mostly just a knife, IIRC.
And busted out of the ice from the Cask of Ancient Winters, which was powerful enough to muck up the Bifrost. And yeah, based on Loki's comments in the first Thor film, Heimdall's implied power is pretty high up there.

But which Spiderman? MCU version is strong, but still a noob (at least, up until Homecoming), so he'd go down hard, IMO. But someone like Garfield Spiderman has displayed WAY faster combat (and movement) speed than Heimdall ever has, so he'd have an absolute nightmare even laying a finger on him.

nothing heimdall can do except lose

Spidey held together two splitting portions of an ocealiner

Heimdall gets his face squeezed and he dies

Yeah, they are really beefing this version up. I thought the jet bridge was impressive, but that ship feat was just ridiculous. Also, based on that fight sequence from the trailer, he seems to have a better handle on his spider-sense/agility as well.