Seabiscuit was the top-earning thoroughbred racehorse in the US throughout the 1940s.
As noted in the 2003 Academy Award-nominated film of the same name, Seabiscuit famously beat 1937 Triple-Crown winner War Admiral in a two-horse race and was considered a symbol of hope to millions during the Great Depression.
Seabiscuit was a hero, but Secretariat set the speed record at the Kentucky Derby, Preakness Stakes, and Belmont Stakes in winning the Triple Crown in 1973. Secretariat is the fastest of the two horses. However, Seabiscuit's heart cannot be questioned. That means there would be no clear favorite if the two horses faced off, both in their prime.