Between the X40 Ultra and Saros Z70, the X40 Ultra comes out ahead in battery life, while the Saros Z70 wins on suction. Overall, the X40 Ultra scores 70.7 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 14.4 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.
Pick the X40 Ultra if you care most about battery life. The biggest gaps in its favor are battery life.
Pick the Saros Z70 if you care most about suction. Its strongest claims are suction.
Both ship with comparable mopping, lidar, self-empty base, 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 Dreame - X40 Ultra wins
- ▲Battery life — 16.67% more. 210 min vs 180 min.
Why Roborock - Saros Z70 wins
- ▲Suction — 83.33% more. 22000 Pa vs 12000 Pa.
Spec comparison
Cleaning
| Spec | Dreame - X40 Ultra | Roborock - Saros Z70 |
|---|---|---|
| Suction | 12000 Pa | 22000 Palead |
| Mopping | true | true |
| Water tank | 270 ml | 270 ml |
| Dustbin | 350 mllead | 300 ml |
| Carpet detection | true | true |
Navigation
| Spec | Dreame - X40 Ultra | Roborock - Saros Z70 |
|---|---|---|
| Lidar | true | true |
| Camera navigation | true | true |
| AI obstacle avoidance | true | true |
| Max climb | 60 mmlead | 40 mm |
Autonomy
| Spec | Dreame - X40 Ultra | Roborock - Saros Z70 |
|---|---|---|
| Battery life | 210 minlead | 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, X40 Ultra or Saros Z70?+
Saros Z70 delivers 22000 Pa vs 12000 Pa.
Do X40 Ultra or Saros Z70 mop?+
Both can mop.
Which has a self-emptying base, X40 Ultra or Saros Z70?+
Both ship with a self-emptying base.
Spec-level deep dives
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