Having watched several videos on YouTube, I have to confess, for me, Frankel was the greatest racehorse of all time. Check it here and make up your own mind:
https://www.youtube.com/watch?v=wtVTFb9Tf7k
Enjoy . . .
Frankel
Best flat horse that I've ever seen. When Lester Piggott claimed Sea Bird and Ribot were better, I looked up Ribot, his win in the King George was breathtaking, but it's quite hard to make a comparison when I don't know much about the opposition.