Which was / is the greatest race horse of all time?

I do remember Red Rum, he was quite a legend here in the UK, such a beautiful horse.
I don`t like horse racing, so many get injured + die. :0(

My Bad...I thought it was Man-O-War...Hell...It has been a LONG time since I read the book...

I'm partial to Seabiscuit, because I know the most about him. According to the book I read, he had an admirable spirit. I'm not a fan of horse or dog racing, but I understand the excitement appeal.

They were all great athletes.

Was truly a great horse. I hate horse racing. I lived 3 miles from a big time horse track called The Meadowlands and was close friends with some trainers and groomers. I know what is done to the horses. I don't like it one bit.

I remember when he won the triple crown, he was a great horse.

Phar Lap - one must wonder why kind of records he would have set if he had not been weighted down in order to make the races "fair" - He was a majestic animal and gifted racer.

Too bad I'll Have Another won't be racing in the Belmont.

Secretariat (March 30, 1970 – October 4, 1989) was an American Thoroughbred racehorse, that in 1973 became the first U.S. Triple Crown champion in 25 years, setting new race records in two of the three events in the Series—the Kentucky Derby (1:592⁄5), and the Belmont Stakes (2:24)—records that still stand today.[2]
Secretariat was sired by Bold Ruler out of Somethingroyal, by Princequillo. He was foaled at Meadow Farm in Caroline County, Virginia. Like his famous predecessor Man o' War, Secretariat was a large chestnut colt and was given the same nickname, "Big Red." Secretariat's grandsire, Nasrullah, is also the great-great-grandsire of 1977 Triple Crown winner Seattle Slew.

I couldn't decide between Man 'O War and Secretariat.

Man 'O War has a large Quarter Horse following.

red rum he won the grand national at aintree in THE UK,3 TIMES

mano war and seabiscuit.........

Both great horses.