Nitrous as Anti lag VS. ALS

I heard HP academy are saying nitrous can be used as anti lag to spoil the turbo.

Why would someone use nitrous instead of anti lag system (bang bang)?

Nitrous can be more effective for antilag purposes compared to a conventional antilag system, particularly with large turbochargers. There is however a lot of complexity that goes with a nitrous system, as well as the additional cost of filling the bottle. A traditional antilag system is also very hard on the turbocharger and exhaust system.