Between the L40 Ultra and S9 MaxV Ultra, the L40 Ultra comes out ahead in battery life, while the S9 MaxV Ultra wins on suction and water tank. Overall, the L40 Ultra scores 68.2 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 16.9 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 L40 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 - L40 Ultra wins
- ▲Battery life — 11.11% more. 200 min vs 180 min.
Why Roborock - S9 MaxV Ultra wins
- ▲Suction — 100.00% more. 22000 Pa vs 11000 Pa.
- ▲Water tank — 15.38% more. 300 ml vs 260 ml.
Spec comparison
Cleaning
| Spec | Dreame - L40 Ultra | Roborock - S9 MaxV Ultra |
|---|---|---|
| Suction | 11000 Pa | 22000 Palead |
| Mopping | true | true |
| Water tank | 260 ml | 300 mllead |
| Dustbin | 320 ml | 350 mllead |
| Carpet detection | true | true |
Navigation
| Spec | Dreame - L40 Ultra | Roborock - S9 MaxV Ultra |
|---|---|---|
| Lidar | true | true |
| Camera navigation | true | true |
| AI obstacle avoidance | true | true |
| Max climb | 40 mm | 40 mm |
Autonomy
| Spec | Dreame - L40 Ultra | Roborock - S9 MaxV Ultra |
|---|---|---|
| Battery life | 200 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, L40 Ultra or S9 MaxV Ultra?+
S9 MaxV Ultra delivers 22000 Pa vs 11000 Pa.
Do L40 Ultra or S9 MaxV Ultra mop?+
Both can mop.
Which has a self-emptying base, L40 Ultra or S9 MaxV Ultra?+
Both ship with a self-emptying base.
Spec-level deep dives
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