The Alen BreatheSmart 45i is ideal for individuals prioritizing powerful, dedicated air purification in very large spaces like open-plan living areas, master bedrooms, or extensive home offices up to 1900 sq ft. This buyer needs robust removal of allergens, dust, pet dander, and smoke, valuing a high CADR of 1216 for smoke and a SmartSensor for automated fan speed. They seek uncompromising air quality and appreciate features like quiet operation with pink noise for sleep, not requiring humidification from their purifier.

The Blueair 2-in-1 is best suited for buyers seeking a multi-functional device for smaller rooms where both air purification and humidity control are important, covering up to 359.58 sq ft for purification and 1726 sq ft for humidification. This user might suffer from dry air or simply desire balanced indoor air, appreciating the convenience of a single unit. They value features like easy top-pour water refills and auto-dry mode, accepting that its purification power is lower than a dedicated unit for the benefit of combined functionality.