Who is the best horse?

[Seattleallstar]

Originally Posted by cakes44

Zenyatta, Beholder, Wise Dan, American Pharoah, MDO, Saint Liam, or Pleasantly Perfect?

Don't care what your interpretation of "best horse" is, you just have to back it up.

Going at a Mile MDO

At a Classic distance tossup between PP and Zenyatta. MDO and St Liam would look like winners but just come up a little short