Video Game What If #2: Samus Aran vs. Master Chief?

NO, don't go blasting me with angry, flaming comments of death. And yes, I know, Machinima already did this or something similar. AND I know Monty Oum did Haloid based on this (along with good effects). But yes, pick and defend who you think would win/lose. Type some more if you believe a tie is good. Don't troll, don't get too excited on this, and write cohesively :D