Here's a comparison:
* Siberian tigers are the largest of all tiger subspecies, with males reaching up to 10 feet in length and weighing up to 700 pounds.
* Sumatran tigers are the smallest of all tiger subspecies, with males reaching up to 9 feet in length and weighing up to 300 pounds.
So, while both are impressive predators, Siberian tigers are significantly larger and heavier than Sumatran tigers.