i'm sorry but i pick master chief haven't even give him a chance. their's still halo 3 coming it's way, so it ain't over.
MC all the way pwn that samus he can just stand there while samus "trys" to kill MC and then MC can just shoot her =)
Samus for me of course, it would take a long time for MC to kill Samus for all the Energy Tank Samus has. Samus fought more huge monsters, Ridley, Kraid, Metroid Prime, Giant Space Pirtes, etc. But it's all based on our biased opinion. Though the soldiers in MP2 sucked. Can't even last in the dark world, what if Samus fought MC in the Dark World?
+ the fact that if they were to fight in dark aether, samus could just not charge any energy crystals, and wait while MC dies slowly... but surely. Hoo HAH!
I'd say it would determine the circumstances. Like if Samus was running up to cheif from long distance he would pull out a sniper and blast her head out. And if she was coming behind him he would see her on motion sensor and put a few holes in her. On the other hand if he only had a smg he would probably loose becuase samus has so much good defence. And since samus has different suits that can allow her to do different stuff that also matter.
And if MC pushed Samus off, it would be more difficult for MC to fight Dark Samus (MP2), since Dark Samus has more agility and uses a lot of Phazon, saverly intoxicating to many life forms. But Samus killed Dark Samus in the Dark World with her Dark Suit and Phazon absorb. But if Samus were to fight MasterChief in the Dark World, Master Chief would died faster because of the atmosphere and all the Dark creatures in MP2. Besides, Samus has finished one of her missions when Planet Zebes exploded. I don't know, someone should make a comic or some media bout this, then we can see the battle!