Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Roborock - S9 MaxV Ultra | Yeedi - Cube |
|---|---|---|
| Suction | 22000 Pa | 8000 Pa |
| Water tank | 300 ml | 230 ml |
| AI obstacle avoidance | true | false |
Between the S9 MaxV Ultra and Cube, the S9 MaxV Ultra comes out ahead in suction / water tank, while the Cube wins on several specs. Overall, the S9 MaxV Ultra scores 88 and the Cube scores 80.1 on our Mars Score.
Which should you buy?
The S9 MaxV Ultra edges ahead on the Mars Score (88 vs 80.1), but the 7.9-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the S9 MaxV Ultra if you care most about suction / water tank. The biggest gaps in its favor are suction, water tank, ai obstacle avoidance. The single most decisive one: Suction — 175.00% more. 22000 Pa vs 8000 Pa.
The Cube similarly does not 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 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 - S9 MaxV Ultra or Yeedi - Cube?
Roborock - S9 MaxV Ultra leads the current Mars Score by 7.9 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 - S9 MaxV Ultra if…
Roborock - S9 MaxV Ultra has the measurable edge on suction pa, water tank capacity ml, has ai obstacle avoidance.
Choose Yeedi - Cube if…
Yeedi - Cube does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
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 - 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.