Poseidon's water powers and ability to shape it into anything give him an edge in the battle. He can create a water dome to protect himself from Zeus' lightning powers and can use his speed and agility to evade his attacks. Additionally, Poseidon's ability to summon a kraken gives him a powerful ally in battle. While Zeus may be faster and have hand-to-hand skills, Poseidon's control over water makes him the ultimate victor in this battle.