Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Roborock - S8 Pro Ultra | Roborock - Saros Z70 |
|---|---|---|
| Suction | 6000 Pa | 22000 Pa |
| Water tank | 180 ml | 270 ml |
| Noise | 67 dB | 65 dB |
Between the S8 Pro Ultra and Saros Z70, the S8 Pro Ultra comes out ahead in several specs, while the Saros Z70 wins on suction / water tank. Overall, the S8 Pro Ultra scores 79 and the Saros Z70 scores 88 on our Mars Score.
Which should you buy?
The Saros Z70 is the clear pick on raw spec strength, leading by 9.0 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.
The S8 Pro Ultra does not pull ahead on any single popular-comparison spec — its strengths sit in the spec-table groups rather than the headline advantages.
Pick the Saros Z70 if you care most about suction / water tank. Its strongest claims are suction, water tank, noise. The single most decisive one: Suction — 266.67% more. 22000 Pa vs 6000 Pa.
Both ship with comparable mopping, lidar, battery life, so those specs do not separate the two — focus on the differences below.
Bottom line: the Saros Z70 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 - S8 Pro Ultra or Roborock - Saros Z70?
Roborock - Saros Z70 leads the current Mars Score by 9.0 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 - S8 Pro Ultra if…
Roborock - S8 Pro Ultra does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
Choose Roborock - Saros Z70 if…
Roborock - Saros Z70 has the measurable edge on suction pa, water tank capacity ml, noise db.
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 - S8 Pro Ultra wins
- No decisive advantages.
Why Roborock - Saros Z70 wins
- ▲Suction — 266.67% more. 22000 Pa vs 6000 Pa.
- ▲Water tank — 50.00% more. 270 ml vs 180 ml.
- ▲Noise — 2.00 dB less. 65 vs 67.
Spec comparison
Cleaning
| Spec | Roborock - S8 Pro Ultra | Roborock - Saros Z70 |
|---|---|---|
| Suction | 6000 Pa | 22000 Palead |
| Mopping | true | true |
| Water tank | 180 ml | 270 mllead |
| Dustbin | 400 mllead | 300 ml |
| Carpet detection | true | true |
Navigation
| Spec | Roborock - S8 Pro Ultra | Roborock - Saros Z70 |
|---|---|---|
| Lidar | true | true |
| Camera navigation | true | true |
| AI obstacle avoidance | true | true |
| Max climb | 20 mm | 40 mmlead |
Autonomy
| Spec | Roborock - S8 Pro 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 | 67 dB | 65 dBlead |
Frequently asked
Which has stronger suction, S8 Pro Ultra or Saros Z70?+
Saros Z70 delivers 22000 Pa vs 6000 Pa.
Do S8 Pro Ultra or Saros Z70 mop?+
Both can mop.
Which has a self-emptying base, S8 Pro Ultra or Saros Z70?+
Both ship with a self-emptying base.