Big balls.
Explanation: a big dick with small balls (assuming that was what the other half of the question might be) would just look ridiculous. You'd have a big slap of sausage with two little nuggets hiding behind it. To make matters worse, the size of the thing would just add to the optical illusion of having rabbit turds for testicles. Plus, you'd be mocked and ridiculed every time a girl or trucker (if that's your thing) whipped off your shorts. No thanks.
Big balls on the other hand, while looking a tad ridiculous with a small pecker, would be a great party gag and something to really be proud of. You could teabag your friends, have a picture taken, and feel proud, not embarrased. You could make up for your tiny ding-a-ling by exerting their full, natural weight into every thrust. You could even pull a "Nick the Dick - Bachelor Party" joke with 'em, which would definitely make you my hero.
So there you have it. If I had to choose. I'd take the balls
