Commander Shepard vs Master Chief
The protagonist of Mass Effect takes on Halo's Master Chief for the title of Xbox badass.
Shepard is a Vanguard for this match-up. Vanguards are soldiers with mixed training in biotics and firearms for use in assault. Biotics are genetical implants that grant the wielder super-natural powers such as casting powerful barriers, throw objects meters, warp, hold opponents in stasis for extended periods of time among other powers I currently forget. They prefer to cast their biotics to render their victims defenseless and then finish them off with a shotgun to the face.
Shepard will also have a Sniper Rifle, pistol and Assault rifle. (He can actually carry all of them at the same time in the game so no complaining) He will have cryo grenades. He has shields as well and can replenish them with his biotics.
Shepards background will be earthborn and a War Hero--holding off an entire unit until reinforcements arrived.
Against this Spectre is The Master Chief who is armed with his trusty Assault Rifle and a energy sword. He will also have 2 frags, plasmas and spike grenades. The Chief will have a bubble shield and regenerator.
Lets rock.