Between the S9 MaxV Ultra and Cube, the S9 MaxV Ultra comes out ahead in suction and water tank, while the Cube wins on several specs. Overall, the S9 MaxV Ultra scores 85.1 and the Cube scores 61.3 on our Mars Score.
Which should you buy?
The S9 MaxV Ultra is the clear pick on raw spec strength, leading by 23.8 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 S9 MaxV Ultra if you care most about suction and water tank. The biggest gaps in its favor are suction, water tank, ai obstacle avoidance.
The Cube similarly doesn't carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
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 - S9 MaxV Ultra wins
- ▲Suction — 175.00% more. 22000 Pa vs 8000 Pa.
- ▲Water tank — 30.43% more. 300 ml vs 230 ml.
- ▲Has AI obstacle avoidance.
Why Yeedi - Cube wins
- No decisive advantages.
Spec comparison
Cleaning
| Spec | Roborock - S9 MaxV Ultra | Yeedi - Cube |
|---|---|---|
| Suction | 22000 Palead | 8000 Pa |
| Mopping | true | true |
| Water tank | 300 mllead | 230 ml |
| Dustbin | 350 mllead | 300 ml |
| Carpet detection | true | true |
Navigation
| Spec | Roborock - S9 MaxV Ultra | Yeedi - Cube |
|---|---|---|
| Lidar | true | true |
| Camera navigation | truelead | false |
| AI obstacle avoidance | truelead | false |
| Max climb | 40 mmlead | 20 mm |
Autonomy
| Spec | Roborock - S9 MaxV Ultra | Yeedi - Cube |
|---|---|---|
| Battery life | 180 min | 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, S9 MaxV Ultra or Cube?+
S9 MaxV Ultra delivers 22000 Pa vs 8000 Pa.
Do S9 MaxV Ultra or Cube mop?+
Both can mop.
Which has a self-emptying base, S9 MaxV Ultra or Cube?+
Both ship with a self-emptying base.
Spec-level deep dives
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