Serpentines? I never use them. Culverins have longer range and not a significantly lower ammount of ammo. Plus, if you have to assault a castle in order to avoid a possible attempt to lift the siege, they will come in handy, whereas serpentines will not.
I did some experiments a while ago with each artillery type, checking which caused more casualties upon an incoming army of fodder. Culverins worked better overall.
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