stone golems

Stone golems are more durable stronger than clay golems, but they are considerably more expensive. They are generally not very popular golems to use because of their high cost.
Dwarves  have innate skill with stone work and hold worked stone in great reverence, so they are more likely to use stone golems than other types of golems. They are pretty much the only group to regularly do so.
Besides the dwarves, the second most common users of stone golems are those who value stealth and subterfuge. A stone golem can easily impersonate a regular statue and can thus surprise enemies in the right setting.
For the RPG mechanics of creating stone golems, check out Stone Golems by the Numbers.