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 and water tank. Overall, the S8 Pro Ultra scores 57.7 and the Saros Z70 scores 85.1 on our Mars Score.
Which should you buy?
The Saros Z70 is the clear pick on raw spec strength, leading by 27.4 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 doesn't 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 and water tank. Its strongest claims are suction, water tank, noise.
Both ship with comparable mopping, lidar, battery life, so those specs don't 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.
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.
Spec-level deep dives
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