Catapults:
European catapults: rocks, split ball,fireballs
Muslim catapults: rocks,fire pots, fireballs
Mongolian catapults: All of the above have
Byzantium larger catapults:Big size ammunition(Upgraded from Catapults)

Ballista:

Scorpius:straight shot bolt,flammable bolt,throw shot bolt
Ballista giant:Launch precise rocks, but have a short range,Fixed
Ballista medium:Large scorpion, slower loading, longer range, higher power
Polybolos:quickly loaded,Fixed

Trebuchet:
Light trebuchet(gravel): rocks(large), split ball (large), fireball (large),Fixed
Light trebuchet(firepot):rocks (large), fire pots(large), fireball (large),Fixed
Moveable trebuchet: rocks (large), fire pots(large), fireball (large),Can move
Heavy trebuchet: All of the above have(longer range),Fixed



Bombard: rocks, fireballs
Culverin: hollow leadbomb (with ignition aoe),Solid leadball
Mortar: leadball, hollow airburst shells (with small ignition)
Giant Bombard: huge rocks (Giant Burst), flammable rocks(Giant Burst)
Organ cannon:continuous firing firearm,Simultaneous scattering(Portuguese and Italian factions,new unit)
Rocketcart:rocket(Mongolian Faction,new model)

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Medieval stone walls were difficult to break through, and catapults could only destroy wooden structures such as towers and battlements, making it difficult to inflict devastating damage on the walls (unless you only attack one point at any cost). This is also why so many lords built them. This situation did not change until Cannon was widely used. Afterwards, the castle became a fortress.

So classical artillery mainly focuses on personnel casualties or the gate/tower

The walls are more difficult to break through, and Classical artillery（like catapults） were difficult to knock down the stone walls (except for wooden walls). Only solid shells from later gunpowder guns can cause certain damage to stone walls (Great Bombard are very effective)

The Defense tower has been enhanced, divided into arrow tower and throwing tower, and The tower can be easily destroyed by them. So the classical artillery should prioritize attacking the defenders on the tower and walls