Who is best leader.....Che Guevara or Bush?

Che...the man who fought for Cuban people though being a argentine....and the Bush who fought against the Iraqis....in the name of nuclear weapon.....(though it wasn't there.)...who fought against the mankind....he told that iraq is the threat for the world...but now it is clear that who is the greatest threat to the world and the human beings...so who is the greatest leader.....