Machamp.
I'd take him as pretty simply tanking bullets. After all, being slammed by a steelix or even punched by another Machamp would be way worse than being shot by a revolver, and Machamp's capable of taking either of those multiple times and still fighting.
He punches faster than Ocelot shoots, he tanks what Ocelot can shoot better than Ocelot tanking what Machamp deals out, they both aren't missing (and the EM shield is not working on melee, especially shown in Metal Gear Acid 2 where knives and swords still work while bullets get deflected), and Machamp has much less chance of being slow or theatrical in his attempt.
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