Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Dreame - L40 Ultra | Roborock - S8 Pro Ultra |
|---|---|---|
| Suction | 11000 Pa | 6000 Pa |
| Water tank | 260 ml | 180 ml |
| Battery life | 200 min | 180 min |
| Noise | 65 dB | 67 dB |
Between the L40 Ultra and S8 Pro Ultra, the L40 Ultra comes out ahead in suction / water tank, while the S8 Pro Ultra wins on several specs. Overall, the L40 Ultra scores 82.9 and the S8 Pro Ultra scores 79 on our Mars Score.
Which should you buy?
The L40 Ultra edges ahead on the Mars Score (82.9 vs 79), but the 3.9-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the L40 Ultra if you care most about suction / water tank. The biggest gaps in its favor are suction, water tank, battery life, among others. The single most decisive one: Suction — 83.33% more. 11000 Pa vs 6000 Pa.
The S8 Pro Ultra 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, self-empty base, 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: Dreame - L40 Ultra or Roborock - S8 Pro Ultra?
Dreame - L40 Ultra leads the current Mars Score by 3.9 points.The more useful decision is the trade-off behind that result: compare suction, battery life against the way you will actually use the product.
Choose Dreame - L40 Ultra if…
Dreame - L40 Ultra has the measurable edge on suction pa, water tank capacity ml, battery life min.
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.
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 Dreame - L40 Ultra wins
- ▲Suction — 83.33% more. 11000 Pa vs 6000 Pa.
- ▲Water tank — 44.44% more. 260 ml vs 180 ml.
- ▲Battery life — 11.11% more. 200 min vs 180 min.
- ▲Noise — 2.00 dB less. 65 vs 67.
Why Roborock - S8 Pro Ultra wins
- No decisive advantages.
Spec comparison
Cleaning
| Spec | Dreame - L40 Ultra | Roborock - S8 Pro Ultra |
|---|---|---|
| Suction | 11000 Palead | 6000 Pa |
| Mopping | true | true |
| Water tank | 260 mllead | 180 ml |
| Dustbin | 320 ml | 400 mllead |
| Carpet detection | true | true |
Navigation
| Spec | Dreame - L40 Ultra | Roborock - S8 Pro Ultra |
|---|---|---|
| Lidar | true | true |
| Camera navigation | true | true |
| AI obstacle avoidance | true | true |
| Max climb | 40 mmlead | 20 mm |
Autonomy
| Spec | Dreame - L40 Ultra | Roborock - S8 Pro Ultra |
|---|---|---|
| Battery life | 200 minlead | 180 min |
| Self-empty base | true | true |
| Self-wash mop | true | true |
| Self-dry mop | true | true |
| Noise | 65 dBlead | 67 dB |
Frequently asked
Which has stronger suction, L40 Ultra or S8 Pro Ultra?+
L40 Ultra delivers 11000 Pa vs 6000 Pa.
Do L40 Ultra or S8 Pro Ultra mop?+
Both can mop.
Which has a self-emptying base, L40 Ultra or S8 Pro Ultra?+
Both ship with a self-emptying base.