I am not Grumpy, but having seen the David Vizard's nitrous book, I'll throw in what I've learned, but I won't say nitrous is "superior" to anything....using nitrous is like having boost ON TAP. you can have as much torque as you want at any rpm. It does away with intercooler since the nitrous is cool, it never received any work but rather absorbs heat from its surrounding. If n2o is injected in liquid form it's even colder. The injection can be staged to turn out any torque curve you want as long as you plan it beforehand. When used in a turbo engine, it complements the turbo very well : a small amount of nitrous injected at low rpm suddently boosts the amount of exhaust gas expelled. The extra exhaust spools up the turbine and creates turbo boost earlier.
I'd say that nitrous + forced induction is superior to forced induction alone, but that's a given
BTW, when I said "injection" it means nitrous and fuel, not nitrous alone.