Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Roborock - Qrevo Master | Roborock - S9 MaxV Ultra |
|---|---|---|
| Suction | 10000 Pa | 22000 Pa |
| Water tank | 250 ml | 300 ml |
| Noise | 64 dB | 65 dB |
Between the Qrevo Master and S9 MaxV Ultra, the Qrevo Master comes out ahead in noise, while the S9 MaxV Ultra wins on suction / water tank. Overall, the Qrevo Master scores 81.3 and the S9 MaxV Ultra scores 88 on our Mars Score.
Which should you buy?
The S9 MaxV Ultra edges ahead on the Mars Score (81.3 vs 88), but the 6.7-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Qrevo Master if you care most about noise. The biggest gaps in its favor are noise. The single most decisive one: Noise — 1.00 dB less. 64 vs 65.
Pick the S9 MaxV Ultra if you care most about suction / water tank. Its strongest claims are suction, water tank. The single most decisive one: Suction — 120.00% more. 22000 Pa vs 10000 Pa.
Both ship with comparable mopping, lidar, battery life, so those specs do not separate the two — focus on the differences below.
Bottom line: the S9 MaxV Ultra 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: Roborock - Qrevo Master or Roborock - S9 MaxV Ultra?
Roborock - S9 MaxV Ultra leads the current Mars Score by 6.7 points.The more useful decision is the trade-off behind that result: compare suction against the way you will actually use the product.
Choose Roborock - Qrevo Master if…
Roborock - Qrevo Master has the measurable edge on noise db.
Choose Roborock - S9 MaxV Ultra if…
Roborock - S9 MaxV Ultra has the measurable edge on suction pa, water tank capacity ml.
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 Roborock - Qrevo Master wins
- ▲Noise — 1.00 dB less. 64 vs 65.
Why Roborock - S9 MaxV Ultra wins
- ▲Suction — 120.00% more. 22000 Pa vs 10000 Pa.
- ▲Water tank — 20.00% more. 300 ml vs 250 ml.
Spec comparison
Cleaning
| Spec | Roborock - Qrevo Master | Roborock - S9 MaxV Ultra |
|---|---|---|
| Suction | 10000 Pa | 22000 Palead |
| Mopping | true | true |
| Water tank | 250 ml | 300 mllead |
| Dustbin | 300 ml | 350 mllead |
| Carpet detection | true | true |
Navigation
| Spec | Roborock - Qrevo Master | Roborock - S9 MaxV Ultra |
|---|---|---|
| Lidar | true | true |
| Camera navigation | true | true |
| AI obstacle avoidance | true | true |
| Max climb | 25 mm | 40 mmlead |
Autonomy
| Spec | Roborock - Qrevo Master | Roborock - S9 MaxV Ultra |
|---|---|---|
| Battery life | 180 min | 180 min |
| Self-empty base | true | true |
| Self-wash mop | true | true |
| Self-dry mop | true | true |
| Noise | 64 dBlead | 65 dB |
Frequently asked
Which has stronger suction, Qrevo Master or S9 MaxV Ultra?+
S9 MaxV Ultra delivers 22000 Pa vs 10000 Pa.
Do Qrevo Master or S9 MaxV Ultra mop?+
Both can mop.
Which has a self-emptying base, Qrevo Master or S9 MaxV Ultra?+
Both ship with a self-emptying base.