How do capital ships decide what weapon to shoot at what target?

So a capital ship's crew's targeting priority takes in two factors. It's the size and the potential threat of their opposing entity. So, for example, the Idris railgun is a bit of a devastating piece of equipment, but it would be like threading a needle trying to hit a small, nimble fighter like a Gladius or even a Xi'an scout ship. So that's where we have the turret gunners take into consideration the smaller entities like fighters, but then they would prioritize a torpedo or a missile and focus their targets towards that, because that's actually a higher threat to damage them more than a smaller fighter.