Here's a comparison:
* Clydesdale: Known for their massive size, with average heights of 17-19 hands (68-76 inches).
* Belgian: Slightly smaller than Clydesdales, with average heights of 16-18 hands (64-72 inches).
* Shire: Historically the largest draft horse breed, but modern Shires tend to be smaller than Clydesdales, with average heights of 16-17 hands (64-68 inches).
While all three breeds are impressive in size, the Clydesdale consistently takes the crown for the tallest and most massive.