Coway - Airmega 200M vs Dyson - Purifier Big+Quiet Formaldehyde
Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Coway - Airmega 200M | Dyson - Purifier Big+Quiet Formaldehyde |
|---|---|---|
| Coverage | 33 m² | 100 m² |
| CADR | 400 m³/h | 640 m³/h |
| Min noise | 25 dB | 24 dB |
Between the Airmega 200M and Purifier Big+Quiet Formaldehyde, the Airmega 200M comes out ahead in several specs, while the Purifier Big+Quiet Formaldehyde wins on coverage / cadr. Overall, the Airmega 200M scores 74.2 and the Purifier Big+Quiet Formaldehyde scores 89.3 on our Mars Score.
Which should you buy?
The Purifier Big+Quiet Formaldehyde is the clear pick on raw spec strength, leading by 15.1 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
The Airmega 200M does not pull ahead on any single popular-comparison spec — its strengths sit in the spec-table groups rather than the headline advantages.
Pick the Purifier Big+Quiet Formaldehyde if you care most about coverage / cadr. Its strongest claims are coverage, cadr, min noise. The single most decisive one: Coverage — 203.03% more. 100 m² vs 33 m².
Both ship with comparable true hepa h13+, activated carbon, so those specs do not separate the two — focus on the differences below.
Bottom line: the Purifier Big+Quiet Formaldehyde is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Coway - Airmega 200M or Dyson - Purifier Big+Quiet Formaldehyde?
Dyson - Purifier Big+Quiet Formaldehyde leads the current Mars Score by 15.1 points.The more useful decision is the trade-off behind that result: compare cadr, coverage, min noise against the way you will actually use the product.
Choose Coway - Airmega 200M if…
Coway - Airmega 200M does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
Choose Dyson - Purifier Big+Quiet Formaldehyde if…
Dyson - Purifier Big+Quiet Formaldehyde has the measurable edge on coverage m2, cadr m3h, noise db min.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Coway - Airmega 200M wins
- No decisive advantages.
Why Dyson - Purifier Big+Quiet Formaldehyde wins
- ▲Coverage — 203.03% more. 100 m² vs 33 m².
- ▲CADR — 60.00% more. 640 m³/h vs 400 m³/h.
- ▲Min noise — 1.00 dB less. 24 vs 25.
Spec comparison
Performance
| Spec | Coway - Airmega 200M | Dyson - Purifier Big+Quiet Formaldehyde |
|---|---|---|
| CADR | 400 m³/h | 640 m³/hlead |
| Coverage | 33 m² | 100 m²lead |
| True HEPA H13+ | true | true |
| Activated carbon | true | true |
Smart & Noise
| Spec | Coway - Airmega 200M | Dyson - Purifier Big+Quiet Formaldehyde |
|---|---|---|
| Min noise | 25 dB | 24 dBlead |
| Air quality sensor | true | true |
| Smart app | false | truelead |