Playing alot of the Alexander the great DLC in Diplomacy and it’s navy is really good as it tells you what your enemy is doing if they are building docks for civilian ships or shipyards for navy.
Additionally Trireme and Onager ships are amazing with Trireme practically beating everything untill their hard counter comes into play such as demoships or to a lessor extent bombard ships. Onager ships are perfect at destroying masses of demoships but die to cannon galleon but then there’s the leviathan which is kinda needs a MASSIVE rework it’s good as a siege ship but it’s aura and size are pointless.