Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Roborock - S9 MaxV Ultra | Roborock - Saros Z70 |
|---|---|---|
| Water tank | 300 ml | 270 ml |
Between the S9 MaxV Ultra and Saros Z70, the S9 MaxV Ultra comes out ahead in water tank, while the Saros Z70 wins on several specs. Overall, the S9 MaxV Ultra scores 88 and the Saros Z70 scores 88 on our Mars Score.
Which should you buy?
These two are evenly matched on the broad strokes; the decision sits on which individual spec advantages weigh more for your use.
Pick the S9 MaxV Ultra if you care most about water tank. The biggest gaps in its favor are water tank. The single most decisive one: Water tank — 11.11% more. 300 ml vs 270 ml.
The Saros Z70 similarly does not carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable suction, mopping, lidar, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Roborock - S9 MaxV Ultra or Roborock - Saros Z70?
The two products are effectively tied on the current Mars Score.The more useful decision is the trade-off behind that result: compare the highlighted specifications against the way you will actually use the product.
Choose Roborock - S9 MaxV Ultra if…
Roborock - S9 MaxV Ultra has the measurable edge on water tank capacity ml.
Choose Roborock - Saros Z70 if…
Roborock - Saros Z70 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
- ▲Water tank — 11.11% more. 300 ml vs 270 ml.
Why Roborock - Saros Z70 wins
- No decisive advantages.
Spec comparison
Cleaning
| Spec | Roborock - S9 MaxV Ultra | Roborock - Saros Z70 |
|---|---|---|
| Suction | 22000 Pa | 22000 Pa |
| Mopping | true | true |
| Water tank | 300 mllead | 270 ml |
| Dustbin | 350 mllead | 300 ml |
| Carpet detection | true | true |
Navigation
| Spec | Roborock - S9 MaxV Ultra | Roborock - Saros Z70 |
|---|---|---|
| Lidar | true | true |
| Camera navigation | true | true |
| AI obstacle avoidance | true | true |
| Max climb | 40 mm | 40 mm |
Autonomy
| Spec | Roborock - S9 MaxV Ultra | Roborock - Saros Z70 |
|---|---|---|
| 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 Saros Z70?+
Saros Z70 delivers 22000 Pa vs 22000 Pa.
Do S9 MaxV Ultra or Saros Z70 mop?+
Both can mop.
Which has a self-emptying base, S9 MaxV Ultra or Saros Z70?+
Both ship with a self-emptying base.