Who is the greatest MC of all time?

In hip-hop, overblown claims of greatness are about as common as phony thuggery and fake beefs. All it takes is a delusional rapper with a microphone to announce to the world that he’s the greatest rapper of all time, the greatest rapper alive, or just the greatest, period, for the idea to start taking hold among the masses. In this the anniversary of Biggie's death, the Boston Herald asks?