Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Bose - QuietComfort Ultra 2 | Sony - WH-CH720N |
|---|---|---|
| Weight | 253 g | 192 g |
| Driver size | 35 mm | 30 mm |
| Battery life | 30 h | 35 h |
| Spatial audio | true | false |
Between the QuietComfort Ultra 2 and WH-CH720N, the QuietComfort Ultra 2 comes out ahead in driver size / spatial audio, while the WH-CH720N wins on weight / battery life. Overall, the QuietComfort Ultra 2 scores 70.8 and the WH-CH720N scores 71.4 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (70.8 vs 71.4). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the QuietComfort Ultra 2 if audio quality and feature breadth (ANC, codecs, multipoint) are the lead criteria for your purchase. The biggest gaps in its favor are driver size, spatial audio. The single most decisive one: Driver size — 16.67% more. 35 mm vs 30 mm.
Pick the WH-CH720N if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. Its strongest claims are weight, battery life. The single most decisive one: Weight — 61.00 g less. 192 vs 253.
Both ship with comparable active noise cancellation, multipoint, ldac, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Bose - QuietComfort Ultra 2 or Sony - WH-CH720N?
Sony - WH-CH720N leads the current Mars Score by 0.6 points.The more useful decision is the trade-off behind that result: compare driver size, battery life, weight against the way you will actually use the product.
Choose Bose - QuietComfort Ultra 2 if…
Bose - QuietComfort Ultra 2 has the measurable edge on driver size mm, has spatial audio.
Choose Sony - WH-CH720N if…
Sony - WH-CH720N has the measurable edge on weight g, battery life h.
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 Bose - QuietComfort Ultra 2 wins
- ▲Driver size — 16.67% more. 35 mm vs 30 mm.
- ▲Has Spatial audio.
Why Sony - WH-CH720N wins
- ▲Weight — 61.00 g less. 192 vs 253.
- ▲Battery life — 16.67% more. 35 h vs 30 h.
Spec comparison
Design
| Spec | Bose - QuietComfort Ultra 2 | Sony - WH-CH720N |
|---|---|---|
| Type | over-ear | over-ear |
| Weight | 253 g | 192 glead |
| Water resistance | none | none |
Audio
| Spec | Bose - QuietComfort Ultra 2 | Sony - WH-CH720N |
|---|---|---|
| Driver sizeⓘ | 35 mmlead | 30 mm |
| Impedanceⓘ | 32 Ω | 48 Ωlead |
| Sensitivityⓘ | 98 dB | 100 dBlead |
| Active noise cancellationⓘ | true | true |
| Transparency mode | true | true |
| Spatial audioⓘ | truelead | false |
Battery
| Spec | Bose - QuietComfort Ultra 2 | Sony - WH-CH720N |
|---|---|---|
| Battery lifeⓘ | 30 h | 35 hlead |
| Fast chargeⓘ | true | true |
Connectivity
| Spec | Bose - QuietComfort Ultra 2 | Sony - WH-CH720N |
|---|---|---|
| Bluetoothⓘ | 5.4lead | 5.2 |
| Multipointⓘ | true | true |
| 3.5mm jack | true | true |
| LDACⓘ | false | false |
| aptX HDⓘ | truelead | false |
Frequently asked
Which has better battery life, QuietComfort Ultra 2 or WH-CH720N?+
WH-CH720N lasts 35 hours vs 30 hours.
Do QuietComfort Ultra 2 or WH-CH720N have active noise cancellation?+
Both models have active noise cancellation.
Which supports LDAC, QuietComfort Ultra 2 or WH-CH720N?+
Neither supports LDAC.