Promite controls the allergen associated with dust mites killing dust mites, at least that's my understanding and I'm sure Steve Saunders will correct this , if I'm wrong.
The main benefit from the other product, is from a specific ingredient which opens the airways, improving breathing.
This ingredient has been known and and used in Complementery medicine for decades.
The best way for a consumer to deal with allergens is, good air flow and regular vacuuming with a Water Fltration vacuum.