Anyone who recruits Pantodapoi on purpose for garrison duty, when there is an alternative, has to be out of his mind (or a stickler for historical accuracy, which is OK). Archers and skirmisher units are cheaper to recruit and keep on hand and much more useful, and make fine garrison troops. They even manage to fight off phalanxes, which is more than can be said of Pantodapoi.

I personally prefer to use Eastern skirmishers for garrison.