Lets dispense with all the life-affirming, self esteem boosting bullshit, and just admit size matters. Yes, it has some validity, but lets look at an analogy. You stick a master swordsman in a ring with a man who's got a gun, but who's never touched one until now. Its even odds, but I'll bet on the swordsman. He knows how to use his weapon.
Most people explore.
My point is if the swordsman is facing someone with even a passing familiarity with his tool of choice, the swordsman is in some deep shit. Size DOES matter. Lets admit it and move on. I must say that technique does indeed matter more. Now, hold up there hulk, before you show me how you fist, let me explain.