Roborock and Dreame are the two names most people end up choosing between once they decide to spend real money on a robot vacuum. Both sell robots with a full-service dock — one that empties the dustbin, washes the mop and dries it — and on the box the two lineups look almost interchangeable. They are not. Once you line the spec sheets up, one number separates the two brands more than any other: how tall an obstacle the robot can climb.
This guide compares all seven Roborock and Dreame robots in our catalog, using only the figures recorded there. Every Mars Score cited is the live, formula-computed value; if you want to know exactly how that number is built, read how we score products.
The short answer
- Your home has door thresholds, raised transitions or thick rugs: buy a Dreame. Both the Dreame X50 Ultra and the Dreame X40 Ultra are listed at a 60 mm climb height. No Roborock in our catalog lists more than 40 mm.
- You want the highest score from either brand: the Dreame X50 Ultra, Mars Score 88.5 at $1,699 — the top robot vacuum in our entire catalog.
- You want maximum suction and your floors are flat: the Roborock S9 MaxV Ultra, Mars Score 88.0 at $1,799, with 22,000 Pa — tied for the highest suction we track.
- You want the cheapest full-dock robot from either brand: the Dreame L40 Ultra, Mars Score 82.9 at $1,199, which still climbs 40 mm.
The rest of this guide shows the working.
Every Roborock and Dreame in our catalog
| Robot | Mars Score | Suction | Climb height | Battery | Noise | MSRP |
|---|---|---|---|---|---|---|
| Dreame X50 Ultra | 88.5 | 20,000 Pa | 60 mm | 210 min | 63 dB | $1,699 |
| Roborock Saros Z70 | 88.0 | 22,000 Pa | 40 mm | 180 min | 65 dB | $2,599 |
| Roborock S9 MaxV Ultra | 88.0 | 22,000 Pa | 40 mm | 180 min | 65 dB | $1,799 |
| Dreame X40 Ultra | 83.9 | 12,000 Pa | 60 mm | 210 min | 65 dB | $1,499 |
| Dreame L40 Ultra | 82.9 | 11,000 Pa | 40 mm | 200 min | 65 dB | $1,199 |
| Roborock Qrevo Master | 81.3 | 10,000 Pa | 25 mm | 180 min | 64 dB | $1,599 |
| Roborock S8 Pro Ultra | 79.0 | 6,000 Pa | 20 mm | 180 min | 67 dB | $1,599 |
Before reading the table as a ranking, note what the seven have in common. Every one of them has LiDAR navigation, a camera, AI obstacle avoidance, carpet detection, mopping, and a dock that self-empties, self-washes and self-dries. None of these features separates the brands; they are the entry ticket at this price. The differences are in the numbers.
Climb height: the number that decides whether the robot works in your home
A robot vacuum that cannot cross the strip between your kitchen and your hallway cleans one room and reports that it is stuck. Climb height — the tallest step the robot can drive over — is the most under-read spec on any robot vacuum box, and it is where Dreame and Roborock part ways.
- Dreame: 60 mm on the X50 Ultra and X40 Ultra, 40 mm on the L40 Ultra.
- Roborock: 40 mm on the Saros Z70 and S9 MaxV Ultra, 25 mm on the Qrevo Master, 20 mm on the S8 Pro Ultra.
Two of the three Dreames out-climb every Roborock, and the cheapest Dreame matches the best Roborock. Before you buy, take a ruler to your tallest threshold and the edge of your thickest rug. If the answer is under 20 mm, this section does not matter to you and you can choose on the other specs. If it is over 40 mm, only the two Dreame X-series robots on this page are listed as able to handle it.
Suction: Roborock leads at the top
Suction in pascals (Pa) is the headline figure on every robot vacuum box. It is a manufacturer-stated number, measured in ways that are not standardised across brands, so treat small gaps as noise and large gaps as meaningful.
The large gap is at the top: the Roborock Saros Z70 and S9 MaxV Ultra both list 22,000 Pa, the highest suction in our catalog. The Dreame X50 Ultra lists 20,000 Pa — close enough that we would not choose between them on suction alone. Below that, the lineups spread out: the Dreame X40 Ultra (12,000 Pa) and L40 Ultra (11,000 Pa) list more suction than the Roborock Qrevo Master (10,000 Pa), and the older Roborock S8 Pro Ultra lists 6,000 Pa, the lowest of the seven.
Higher suction matters most on carpet, where debris is trapped between fibres. On hard floors, almost any robot on this page will pick up dust and crumbs; the brush design and the robot's pattern matter more than the last few thousand pascals.
Battery and noise: a small Dreame advantage
All four Roborocks list 180 minutes of runtime. The Dreames list 210 minutes (X50 and X40) and 200 minutes (L40). Every robot here returns to its dock to recharge and resumes where it left off, so battery only decides whether a large home gets cleaned in one pass or two.
On noise, the range is narrow: 63 dB for the Dreame X50 Ultra, 64 dB for the Roborock Qrevo Master, 65 dB for most of the rest, and 67 dB for the Roborock S8 Pro Ultra. Decibels are logarithmic, so the 4 dB between quietest and loudest is audible, but none of these is quiet enough to run unnoticed in the same room.
Bins and water tanks
The robot's onboard dustbin empties into the dock after every run, so its size matters less than it used to. For the record: 350 ml on the Dreame X50, Dreame X40 and Roborock S9 MaxV Ultra; 400 ml on the Roborock S8 Pro Ultra; 320 ml on the Dreame L40; 300 ml on the Roborock Saros Z70 and Qrevo Master.
The onboard water tank feeds the mop between dock visits. The Roborock S9 MaxV Ultra has the largest at 300 ml; the S8 Pro Ultra has the smallest at 180 ml. The rest sit between 250 and 280 ml.
Head-to-head matchups
Flagship: Dreame X50 Ultra vs Roborock Saros Z70
Full side-by-side: Dreame X50 Ultra vs Roborock Saros Z70.
The Saros Z70 is the most expensive robot in our catalog at $2,599. It matches the S9 MaxV Ultra on every number we record — 22,000 Pa, 40 mm, 180 minutes, 65 dB — and has a smaller dustbin and water tank. The Dreame X50 Ultra gives up 2,000 Pa of suction, and in exchange climbs 20 mm higher, runs 30 minutes longer and is 2 dB quieter, for $900 less.
Verdict: on the specifications we track, the X50 Ultra is the better buy. The Saros Z70's premium pays for features that do not appear in our spec sheet; if you are considering it, decide whether those specific features are worth $900 to you.
Suction vs climbing: Dreame X50 Ultra vs Roborock S9 MaxV Ultra
Full side-by-side: Dreame X50 Ultra vs Roborock S9 MaxV Ultra.
This is the real flagship decision. $1,699 against $1,799, Mars Score 88.5 against 88.0. The Roborock has more suction (22,000 vs 20,000 Pa) and a larger water tank (300 vs 280 ml). The Dreame climbs 60 mm against 40 mm, runs 210 minutes against 180, and is 2 dB quieter.
Verdict: if your floors are flat and mostly carpeted, the S9 MaxV Ultra. If you have thresholds or deep rugs, the X50 Ultra — and it is $100 cheaper.
Mid-range: Dreame X40 Ultra vs Roborock Qrevo Master
Full side-by-side: Dreame X40 Ultra vs Roborock Qrevo Master.
The Dreame X40 Ultra ($1,499) undercuts the Roborock Qrevo Master ($1,599) by $100 and leads on suction (12,000 vs 10,000 Pa), climb height (60 vs 25 mm), battery (210 vs 180 minutes) and bin size (350 vs 300 ml). The Qrevo Master is 1 dB quieter.
Verdict: the X40 Ultra, comfortably. The score gap — 83.9 against 81.3 — understates how lopsided the spec sheet is.
Value: Dreame L40 Ultra vs Roborock S8 Pro Ultra
Full side-by-side: Dreame L40 Ultra vs Roborock S8 Pro Ultra.
The cheapest Dreame here costs $400 less than the cheapest Roborock and beats it on suction (11,000 vs 6,000 Pa), climb height (40 vs 20 mm), battery (200 vs 180 minutes), noise (65 vs 67 dB) and water tank (260 vs 180 ml). The S8 Pro Ultra's one win is a larger onboard bin.
Verdict: the L40 Ultra. At list price, the S8 Pro Ultra is hard to justify against any robot on this page; only consider it at a deep discount. You can also see how the L40 compares with Roborock's newer mid-range model: Dreame L40 Ultra vs Roborock Qrevo Master.
Within-brand upgrades
Dreame X40 Ultra → X50 Ultra (+$200). Same 60 mm climb, same 210-minute battery, same bin. The X50 adds 8,000 Pa of suction and is 2 dB quieter. If you vacuum a lot of carpet, the upgrade is worth it; on hard floors, the X40 is the better value. See Dreame X40 Ultra vs Dreame X50 Ultra.
Roborock S9 MaxV Ultra → Saros Z70 (+$800). On our spec sheet, nothing improves: suction, climb, battery and noise are identical, and the bin and tank are smaller. See Roborock S9 MaxV Ultra vs Roborock Saros Z70.
What the spec sheet cannot tell you
We publish what the data supports, so it is worth being explicit about what this comparison does not measure:
- Real-world pickup. Suction is a manufacturer figure. How much debris a robot actually lifts from a given carpet depends on brush design, airflow path and cleaning pattern — none of which is in our data.
- Mopping quality. Every robot here mops and washes its own mop. We record the water tank size, not how well the mop cleans dried-on stains.
- Obstacle avoidance accuracy. All seven list AI obstacle avoidance. How reliably each one dodges cables, socks or pet mess is a matter for hands-on testing.
- App and software. Map editing, no-go zones, room-specific settings and firmware support are a large part of owning a robot vacuum and do not reduce to a number.
- Dock size. Full-service docks are large. Check the dock dimensions against the space you have before you buy.
How to decide, in four questions
- What is your tallest threshold or thickest rug? Over 40 mm: Dreame X50 Ultra or X40 Ultra. 25–40 mm: any of the 40 mm-plus robots. Under 20 mm: every robot here will cope.
- How much of your floor is carpet? Mostly carpet: prioritise suction — the Roborock S9 MaxV Ultra or the Dreame X50 Ultra.
- How large is your home? If a single run regularly exceeds three hours, the Dreames' 200–210 minutes help.
- What is your budget? Under $1,300: the Dreame L40 Ultra is the only Roborock or Dreame here. Around $1,700–1,800: X50 Ultra vs S9 MaxV Ultra, decided by question 1.
Where to go next
- The full ranking of every robot we track: robot vacuums.
- The ten highest-scoring robots from every brand: best robot vacuums in 2026.
- If you share your home with a dog or cat: robot vacuum for pet hair — buying guide.
- Outside these two brands, the Ecovacs Deebot X8 Pro Omni (Mars Score 88.4, $1,299) is worth a look: compare it with the Dreame X50 Ultra.
- How every number on this page was calculated: how we score products.
Prices are manufacturer list prices (MSRP) in USD as recorded in our catalog; retail prices vary and are frequently lower. vsMars does not sell robot vacuums and earns nothing from your choice.
Turn this reading into a better product decision
This buying guide is a decision framework, not a substitute for checking the exact variant, regional price, availability, and warranty that apply to you. Use the linked catalog data to separate published facts from personal priorities, then compare the final shortlist directly rather than relying on a generic ranking.
Verify the fit
Open the Robotic Vacuums category page to filter the relevant field, then inspect full product profiles and the score methodology.
Keep the recommendation current
This article references 7 catalog products; use the live product pages for current specifications and comparison links.
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