Coway - Airmega 200M vs Dyson - Purifier Big+Quiet Formaldehyde
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 and cadr. Overall, the Airmega 200M scores 56.3 and the Purifier Big+Quiet Formaldehyde scores 89.1 on our Mars Score.
Which should you buy?
The Purifier Big+Quiet Formaldehyde is the clear pick on raw spec strength, leading by 32.8 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 doesn't 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 and cadr. Its strongest claims are coverage, cadr, min noise.
Both ship with comparable true hepa h13+, activated carbon, so those specs don't 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.
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 |
Spec-level deep dives
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