None of them - for me.
I got a set of reverb cascade torpedoes (lightweight and high cap) lying around somewhere, but against players they're next to useless and against NPCs they're too slow and too expensive (compared to pacifiers/frags). I also got a few lightweight packhounds - but again, they're not really that effective I ended up using half the load to take down a single NPC Cobra. Might be more interesting in larger ships that can mount 4 or more launchers. Dumbfire at least go off when you want them to, but I usually miss, while seekers would be helpful against small fighters - if it weren't that they need longer to lock on than the fighter stays in my sights. And if I can keep them in the sights long enough for the mssiles to lock, I can also kill them otherwise.
I've seen them used in PvP to bring down/damage external modules (like weapons) successfully - once the shields are down.