[Godlesswanderer]

I would say definately the Master Chief. I can;t remember where I read it but The Master Chief's armour is near indestructible. Hence the fact he can survive very high falls. Also, the Master Chief's sheild is incredibly hard to get down temproarily let alone destroy it. Anyway The Master Chief could just stick a plasma grenade to Stranger and wipe him out.

Edit:

We need to take into consideration the 'Rules of Engagement' set out in the article. i.e. Where? How? etc.