I'd say that this is a pretty well balanced fight.
They are both genetically enhanced soldiers, although Chief's suit might give him an advantage in speed and power.
Chief's suit protects him from a certain amount of damage from any point of contact, while Cap's shield is indestructible.
They're obviously both incredible tacticians and soldiers.
Who wins?
-
No master chief would -blam!- him....... butt -blam!- him.