If you are into F1 none of the below is news. For me, I just now saw Richard Hammond say Clark was the greatest ever and know most say Fangio or Schumacher are, so I did some digging.
Jim Clark was #1 in the 60's as I'm sure the original video clarified. Jackie Stewart was a close second but lead the 70's.
Here's the top seven according to the article below:
https://f1metrics.wordpress.com/2019/11/22/the-f1metrics-top-100/