Who would win in a fight? It's a 4v4 straight up death match with standard gear, armour and abilities.
The UNSC marines are [i]not[/i] Spartans or ODSTs, but the standard, non-specialised marines. The Stormtroopers are the normal ones, not scout troopers or any other variant.
They get no reinforcements, vehicles, assistance, or external help. Both are armed with their standard weaponry: Marines have Asssault Rifles, Stormtroopers have those blastery things they always use.
Reply with your reasoning if you like.
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Halo is gay so star wars by default