Which one would win? Both are powerful, with similar though differing abilities.
Mjolnir Mk. 6:
PROS:
-micro fusion reactor provides a nearly limitless supply of energy.
-energy shield which provides protection from a variety of threats
-reactive circuits and strength multiplying materials vastly increase physical performance
-comprehensive communication suite, capable of supporting starship-grade AI
-built in biofoam injectors allow wearer to survive serious injury
CONS:
-Heavy, weight can actually limit usage of vehicles or transport. Complicates med-evac
-suit requires extensive modification and training to use, capable of killing a normal human
-materials that form suit are non-regenerative, require repairs.
Nanosuit Mk.2:
PROS:
-suite capable of active camouflage, for limited periods of time
-nano materials capable of repairing themselves in the field
-nano machines also capable of repairing or supplanting damaged user tissue or organs
-plug and play technology, doesn't require any previous user training or prep
CONS:
-limited power supply requires advanced capabilities be used for only short periods of time
-overall construction less robust
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Oh the Master Chief rode the For-runner door out of orbit at the beginning of halo 3!