MCU versions, obviously.

Okay, let's take Captain America with Mjolnir and Tony with his suit from the final battle in Endgame (so no Hulkbuster), and pit them against War Hulk (all feats from Incredible Hulk to Thor: Ragnarok are in play. No puny Professor Hulk.). No Grandmaster with the taser. War Hulk gets the same weapons from Ragnarok.

Battle is to the death or KO. Standard arena rules.

Which side takes it?