Claws of Hades in God of War 3 is my favourite. It allows more creative combos than Blades of Chaos, can be a useful way of attacking enemies that attack from below the ground and allows you to summon the souls of enemies and use them against other enemies. The colour also looks cool.

Gauntlet of Zeus in Chains of Olympus and Nemean Cestus in God of War 3 is my second favourite as they are the same weapon with different names, very powerful, fun to use and effective when fightig against a single enemy.

Arms of Sparta in Ghost of Sparta is my third favourite as its effective in both one on one close range combat and in long range combat and it allows amazing combos and is powerful.

Blade of Olympus :)

I added that to the poll.

Sure he is.

I think all the weapons in God of War 2 were also good.