Final answer:
Philip II of Macedon commanded the largest army between the two, raising the most significant Macedonian force of his time through new military tactics and training.
Step-by-step explanation:
Considering the question pertains to the commanders of the largest armies, we must delineate which Philip II is being referred to, as the name corresponds to different historical figures. King Philip II of Macedon, father of Alexander the Great, raised the largest army Macedon had seen by employing common farmers and trained aristocrats while introducing innovative tactics. This included a new form of phalanx and an elite cavalry, significantly expanding his military power and securing new territory.
On the other hand, Philip II of Spain, the leader of European Catholicism, raised a formidable armada against England, funded by the wealth of the New World, though his efforts were ultimately unsuccessful. Comparatively, Philip II of France fought wars over Normandy and led France during its intertwined history with England, but the available information does not indicate the size of his forces.