Who was the greatest U.S. president since the 20th century?

I narrowed it down to T. Roosevelt and JFK. They were both strong leaders who helped put America ahead of the rest of the world with the minimal amount of partisan politics involved. JFK took my vote for his investments in to US infrastructure such as the space program and energy programs(with some help from Ike) which had some of the greatest long term benefits for the US(something modern politicians fail at). TR put a halt to the rampant capitalism that was hurting America's poor while being able to avoid extreme communist/socialist measures, and thus allowed free enterprise to drive our country without exploiting it.