The ideal buyer for the Shark HC451 is someone living in a compact space, like a small bedroom, dorm room, or personal office (up to 104 sq ft), who values multi-functional convenience. They prioritize consolidating devices, needing an air purifier, heater, and fan in one unit. They appreciate features like quiet operation and dimmable lights for an undisturbed environment. While its CADR of 66.67 isn't for rapid large-room purification, its versatility and space-saving design justify the slightly higher price for a 'set it and forget it' year-round climate and air quality solution for their personal space.

The ideal buyer for the VEWIOR KJ300 is someone with a large home, open-plan living area, or specific need for robust and rapid air purification. They prioritize maximizing air quality over multi-functionality and are concerned about smoke, pet dander, or general allergens across significant square footage (up to 3000 sq ft). With a high 1920 CADR for smoke and H13 HEPA filtration, they seek powerful performance at a budget-friendly price. Quiet operation (15dB sleep mode) is a bonus for sensitive areas, making it perfect for those needing serious air cleaning without disruption.