Complex Lists The Best Rapper Alive, Every Year Since 1979 Until Now
I don't personally believe you can definitively say there's a Greatest Rapper of all time because it's subjective and just a matter of personal preference and opinion but Complex has done a great job of trying to break it all down. They break down each year since the first of recorded hip-hop until today to tell which MC held the crown at that moment in time.
Check out the list, argue amongst yourselves and peep the dope artwork along the way.