I'd probably go in guns only. Honestly, I can't see them being too effective as an anti-fighter weapon, and still not getting out of hand. I mean if the kill count in multi is low, then it means it's probably getting boring, and if it's high, then you'll be respawning often enough that you'll keep bringing more missiles into the fight. So if they are effective, you can bet your ass you'll be unloading them as quickly as is useful every respawn. And like you said, if they weren't effective, I wouldn't load them out. Ship would weigh more, explosive as you said, an overall waste of ammo when the fighter does blow up. Don't load out with weapons you can't effectively use. This is why XvT back in the day rarely had missiles in dogfights, most of them were primaries only. Shame that was so difficult to do in FS.