in their primes, shaq was more dominant than duncan. duncan had a more all around game with strengths in defense, offensive moves, rebounding, passing, and shotblocking . but shaq was just a better scorer because he could back down anyone and hit any over the shoulder shot and he was a good rebounder/shotblocker. he didn't have to develop creative ways to score or add a jump shot because it just didn't matter. no one could stop him without fouling. i say right now they are about even. however, once duncan wins one or two more championships, he will move ahead of shaq.