Between the Qrevo Master and S9 MaxV Ultra, the Qrevo Master comes out ahead in noise, while the S9 MaxV Ultra wins on suction and water tank. Overall, the Qrevo Master scores 64.9 and the S9 MaxV Ultra scores 85.1 on our Mars Score.
Which should you buy?
The S9 MaxV Ultra is the clear pick on raw spec strength, leading by 20.2 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.
Pick the Qrevo Master if you care most about noise. The biggest gaps in its favor are noise.
Pick the S9 MaxV Ultra if you care most about suction and water tank. Its strongest claims are suction, water tank.
Both ship with comparable mopping, lidar, battery life, so those specs don't 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.
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.
Spec-level deep dives
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