I'm curious, where do you get this information that missiles were made for the small targets and torpedoes for the big ones?
That idea might come from the PC games. Missiles are faster and harder to dodge; torpedoes are slower and do more damage. Therefore, missiles are better on small targets and torpedoes are better on large targets. Personally, I think the abilities on missiles and torpedoes already lend themselves to this idea, but perhaps not as much as they should.
I see. Never played those games...