Coway Airmega 400S covers 1,560 sq ft with 3-stage HyperCaptive filtration and real-time monitoring per grounded facts. Dyson Pure Cool TP07 at $649 offers HEPA H13 plus carbon filtration, app/voice control, and 350-degree oscillation since its 2021-05 release. Coway wins on room-size performance while Dyson provides better value and fan features.