I have also heard them both play, Simon Live Act and Carl Cox techno and house sets. Simon was better by any means, but only coz he played Live. I disliked Carl Cox infantile shouts he is producing during sets, lifting the crowd with his hands in the air, shouting on the microphone, but still, Carl Cox is the only guy that played for Y2K on 6 different places around the globe, moving around in time so he could actually play 6 different NY...impressive activity.