Im going with Pierce. I feel like he could get his in much more difficult circumstances than IT. IT is a great scorer but I think you scheme a way for him to get his buckets whereas Pierce always had the ability to get this.
One thing that has to be accounted for is the difference in rules, scheme, and overall league style of play. Think what guys like AI would have done in today's game.
I take nothing away from IT but Im going to go with Pierce due to his more well rounded scoring ability