I'm going with Man O' War. I read Seabiscuits story which was really good, the version I read. I think it was by Walter Farley? Or it might have been by the guy that wrote Fury of Broken Wheel, I forget...
Anyway, I also read Man O' Wars story and Pharlaps. I never did read anything on Secretariat, I hear about him since he was born at Meadow Even Park which is where our state fair is held.
Man O' War is the one that impresses me the most, especially since he was forced to carry more weight then any other horse and still won by enormous distances. The only race he lost was because of a stumble and he almost caught the other horse.
He also won 2 I think of the 3 races for the triple crown. He didn't race one because his trainer felt it was too much strain on a young horse. So who knows, maybe he could have even bin a triple crown winner.
Race horse storys are so neat. These animals do have heart and they love what they do. It's a shame that most of them get "thrown away" when their careers are over. I'm just glad so many hunt folks take them on and give them new jobs.