Between the X40 Ultra and S9 MaxV Ultra, the X40 Ultra comes out ahead in battery life, while the S9 MaxV Ultra wins on suction and water tank. Overall, the X40 Ultra scores 70.7 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 14.4 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 X40 Ultra if you care most about battery life. The biggest gaps in its favor are battery life.
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, self-empty base, 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 Dreame - X40 Ultra wins
- ▲Battery life — 16.67% more. 210 min vs 180 min.
Why Roborock - S9 MaxV Ultra wins
- ▲Suction — 83.33% more. 22000 Pa vs 12000 Pa.
- ▲Water tank — 11.11% more. 300 ml vs 270 ml.
Spec comparison
Cleaning
| Spec | Dreame - X40 Ultra | Roborock - S9 MaxV Ultra |
|---|---|---|
| Suction | 12000 Pa | 22000 Palead |
| Mopping | true | true |
| Water tank | 270 ml | 300 mllead |
| Dustbin | 350 ml | 350 ml |
| Carpet detection | true | true |
Navigation
| Spec | Dreame - X40 Ultra | Roborock - S9 MaxV Ultra |
|---|---|---|
| Lidar | true | true |
| Camera navigation | true | true |
| AI obstacle avoidance | true | true |
| Max climb | 60 mmlead | 40 mm |
Autonomy
| Spec | Dreame - X40 Ultra | Roborock - S9 MaxV Ultra |
|---|---|---|
| Battery life | 210 minlead | 180 min |
| Self-empty base | true | true |
| Self-wash mop | true | true |
| Self-dry mop | true | true |
| Noise | 65 dB | 65 dB |
Frequently asked
Which has stronger suction, X40 Ultra or S9 MaxV Ultra?+
S9 MaxV Ultra delivers 22000 Pa vs 12000 Pa.
Do X40 Ultra or S9 MaxV Ultra mop?+
Both can mop.
Which has a self-emptying base, X40 Ultra or S9 MaxV Ultra?+
Both ship with a self-emptying base.
Spec-level deep dives
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