I'd go with space marine right away, but mostly because I played 40k for about 5 years, and played Halo twice.
But I think we should compare ALL their weapons.
Bolter vs. SMG - clear winner is the bolter
Bolt pistol vs. Magnum - bolt pistol is also the clear winner
Lascannon vs. Spartan laser - I'm gonna have to give this one to the lascannon, it just seems to have more armour piercing capability
Grenades - Spartan wins on this one. Marines have frag and krak grenades, Spartans have frag ( i think), plasma, and sticky grenades. Although in Apocalypse any army could have a vortex grenade, which is a portable black hole, but I think we should leave Apocalypse out of this.
Power sword vs. Beam sword - I think these are pretty evenly matched, but I'm gonna give this one to the power sword due to its shape. It's shaped like an actual sword, so it's a lot easier to wield, as well and attack and block with.
Missile launchers - again, evenly matched, but I think Space Marines win by a nose here. Why? Because they have frag AND krak missiles, which might not come in handy in a 1v1 battle, but it's still an advantage overall. Also, the newer miniatures with missile launchers have a backpack that sports an automatic loading arm, as well as like 7 missiles or something (I never actually counted them though)
Now I may be just be going on memory here, but I think Marines still win this one. Oh and one more thing: a Space Marine's armour is bigger than them, so I'm guessing they'd have a big armour advantage over a Spartan.
Tzan wrote: Quantumsurfer wrote:
I generally agree with Tzan
Warhead wrote:I agree with QuantumSmurfer.
I agree with Warhead.