As others have said, I am a fan of the Night Terrors with Seamus and Kirai. Seamus even more so than Kirai because of their aura and because Kirai doesn't really need help getting objectives, and if she does, an insidious madness works well. With McMourning I typically play them in games of 40ss or more, in smaller games I find that 1 Necropunk acting on the flanks can get the job done with some Belle support. And that leaves me with 3 extra ss to spend on murdering. (I use Belles anyway.)
With Nicodem, I often find myself summoning a couple of Necropunks late game for last minute dashes to schemes and strategies, and because at that point, I should have the cards in hand for leaping. Or I start with a couple of them for Killjoy's Seal Team Six. (Shock and awe.) Night Terrors don't really see a spot in my Nicodem lists because of the no corpses and not being able to summon them.
Crooligans. I have yet to test them out, but they seem pretty solid in a bigger game with Seamus + Molly or Nicodem. Other than that...3ss > 4ss.