Who would win between a Space Marine and a UNSC Spartan?

I know this is like comparing apples to oranges or in this case the Space Navy to the Space Marines, but its something you have to ponder none the less because its between two of the most popular games on console today. You have the smaller, faster, more agile, super human UNSC Spartans from Halo and you have the bulky, slower, equally super human warrior in the Space Marine. Both are equally skilled in weaponry and the armor seems about even between the 2 branches. So in a battle between David and Goliath, who would win? Who would win in a 1 on 1 match up and who would win in a war between the 2 branches *using all tech, vehicles and weapons both branches are capable of using in their arsenal* truly a gamers Deadliest WarriorWho would win between a Space Marine and a UNSC Spartan?
depends.. which Spartan? we dont know much about SPARTAN-IV yet. SPARTAN-II was the best. one S-II could easily take one Space Marine. you would probably need 2 SPARTAN-III's to take one, though.

who thumbed me down? you dont know what youre talking about...Who would win between a Space Marine and a UNSC Spartan?
I dont like either of the games or characters, but im sure the Space Marine would win. No offence Halo fanboys, but the Spartans sucked.Who would win between a Space Marine and a UNSC Spartan?
First of all, spartans get growth augmentations. If they survive it, they will get wicked strong. So I would say a spartan would win.