What is the strongest weapon in assassins creed

In Assassin's Creed 1, all the weapons are pretty balanced, so we can leave that out.

In Assassin's Creed 2, the strongest weapon would be the Sword of Altaïr, but the deadliest weapon would be the double hidden blades.

In AC Brotherhood, the Dagger of Brutus appears to be the best weapon to my knowledge.