after having subjected others to it AND being subjected to it myself, i'm gonna have to very firmly go with the neuralizer. it's just such a good visual focus. being able to turn on a faint spiral in the center and guide people's vision before FLASHING them and immediately having them sink (and vice versa for myself,,) there just hasn't been anything that's been as powerful to handle that i've seen. pendulums almost hit this mark but neuralizers are a lot flashier and attention grabbing about it they're so good.

though if i'm not the one wielding it, getting hit by anything will hit hard enough as long as whoever's holding it is doing it with enough hypnosadistic intent. that matters more than any specific toy