Without a doubt for me Lemieux. I am bias tho, I grew up in Pittsburgh in late 80s early 90s and witnessed 1st hand all the glory.
God you guys are getting way off topic. There's actually an infographic comparing Gretzky to Lemieux. In about 95% of the chart, Gretzky was better. I'm not saying Mario was not a fantastic player, but the facts and stats point to Gretzky being the better player.