✨ VS Analyze · VacuumSpain comparison technology. AI-generated explanation based on verified technical data.
Introduction
We're looking at three high-end models launched in 2025 that represent the best from two leading manufacturers in the sector. The Dreame L40s Pro Ultra arrives as Dreame's most aggressive offering, whilst Roborock presents two clearly differentiated options: the QV 35S as a more accessible alternative and the Saros 10R as its technological flagship.
All three units include a multifunction base with mop washing and drying, but the differences in power, navigation systems and smart functions mark quite distinct usage profiles. The Dreame model stands out for its brutal suction power of 19,000 Pa, whilst the Saros 10R opts for the most advanced technology with its StarSight 2.0 system and a 6,400 mAh battery. The QV 35S, with 10,000 Pa, positions itself as the most balanced option in features and price.
Power and Suction
The most striking difference in this robot vacuum comparison is found in suction power. The Dreame L40s Pro Ultra reaches 19,000 Pa, a figure that places it amongst the most powerful on the market. The Roborock Saros 10R comes close with 18,500 Pa, whilst the QV 35S offers 10,000 Pa, half that of its bigger brother.
In practice, this difference is especially noticeable on carpets and rugs. For homes with pets or long-pile carpets, the Dreame's 19,000 Pa makes a real difference.
The brushing system also varies considerably. The Dreame mounts a dual HyperStream brush that prevents hair tangles, the Saros 10R equips Roborock's anti-tangle DuoDivide, and the QV 35S carries a simple silicone brush. All three systems are effective, but the DuoDivide and HyperStream offer clear advantages in homes with long hair or pets.
Both the Dreame and the Saros 10R can lift the main brush during mopping, preventing it from staining the mops or dirtying the freshly mopped floor. The QV 35S lacks this function. The same applies to the side brush: Dreame and Saros 10R lift and extend it to better reach corners, whilst the QV 35S maintains a fixed side brush.
Mopping
All three robots mop with two rotating mops, but the differences in advanced functions are notable. The Dreame L40s Pro Ultra includes mop extension with Roboswing movement, allowing the mops to better reach edges and slightly extend under furniture or overhangs. The Saros 10R has mop extension but without Roboswing, and the QV 35S does not extend the mops.
Mop lifting also varies. The Saros 10R can lift them between 12 and 22 mm, adapting to different carpet heights. The Dreame reaches 10.5 mm and the QV 35S stays at 10 mm. For homes with thick carpets, the Saros 10R's 22 mm is decisive.
Only the Saros 10R mops with warm water, which improves cleaning of greasy stains. The other two models use cold water. Dreame and Saros 10R can automatically remove the mops at the base when you only want to vacuum, something the QV 35S doesn't do.
Dirt detection on mops and floor is present in Dreame and Saros 10R, allowing automatic re-cleaning of dirtier areas. The QV 35S does not incorporate this technology.
Navigation System
The Roborock Saros 10R mounts the StarSight 2.0 system with dual AI camera, frontal 3D laser sensor, LED for night vision and the ability to recognise 108 different obstacles. It can identify pets and allows remote access to the camera from the app.
The Dreame L40s Pro Ultra equips LiDAR turret with dual AI camera, 3D laser sensor, night LED and recognition of 180 obstacles. It also identifies pets, detects curtains to avoid tangles and offers remote camera access. Its CleanGenius system manages cleaning intelligently.
The QV 35S is left with basic LiDAR turret without AI camera, without 3D sensor, without night LED and without pet recognition. It has Roborock's SmartPlan system for route planning, but is clearly the most limited in navigation of the three.
For homes with pets, young children or many obstacles on the floor, the difference between a model with dual AI camera and one without is enormous.
Autonomy and Battery
The Roborock Saros 10R mounts a 6,400 mAh battery that provides 180 minutes of autonomy. The Dreame L40s Pro Ultra and the QV 35S carry 5,200 mAh batteries, but the Dreame achieves 220 minutes of autonomy versus the QV 35S's 180.
This means that the Dreame, despite having less battery capacity than the Saros 10R, offers more operating time. The explanation lies in energy efficiency and in the fact that the Saros 10R equips more technology that consumes energy.
In homes of more than 150 square metres, those extra 40 minutes of the Dreame can make the difference between completing cleaning in one go or needing an intermediate recharge.
Smart Functions
All three models overcome obstacles, but with different capabilities. The Dreame L40s Pro Ultra and the Saros 10R can cross simple steps, whilst the QV 35S overcomes up to 20 mm in height. This function allows crossing thresholds between rooms or small level changes without getting stuck.
The Dreame and the Saros 10R include their own voice assistant in addition to compatibility with Alexa and Google Home. The QV 35S only works with external assistants. Having your own assistant allows controlling more specific robot functions without depending on third-party platforms.
Multifunction Cleaning Base
All three bases perform auto-emptying of the dust bin, mop washing and drying. Washing is done with hot water in all three cases, and drying with hot air, which speeds up the process and prevents bad odours.
Self-cleaning of the washing tray is present in the Dreame (third generation) and in the Saros 10R (version 2.0), but not in the QV 35S. This means that with the QV 35S you'll have to manually clean the tray from time to time to avoid dirt accumulation.
Only the Dreame and the Saros 10R include a detergent tank that is automatically dispensed during mop washing. The QV 35S lacks this function. The Dreame also offers an optional kit to connect the base to water pipes, although it must be purchased separately.
In storage capacities, the Dreame carries the largest dust bag with 3.2 litres, followed by the QV 35S with 2.7 litres and the Saros 10R with 2.5 litres. For clean water, the Dreame stores 4.5 litres, whilst Saros 10R and QV 35S have 4 litres. For dirty water, the Dreame holds 4 litres, the QV 35S 3.5 litres and the Saros 10R 3 litres.
Dimensions
The robot's height is crucial for passing under furniture. The Saros 10R measures only 79.8 mm, which allows it to slip under most sofas and beds without problems. The QV 35S reaches 96.5 mm and the Dreame reaches 103.8 mm. If you have low furniture, the Saros 10R will access areas inaccessible to the other two.
In diameter, the Dreame is slightly more compact with 350 mm versus the 353 mm of both Roborocks. A minimal difference that doesn't affect real-world use.
The bases also vary in size. The Saros 10R has the widest base (381 mm) but the least tall (488 mm). The Dreame measures 340 mm wide and 590.5 mm tall, being the tallest of the three. The QV 35S sits in the middle with 340 mm wide and 521 mm tall. It's advisable to measure the space where you're going to place the base before buying.
Real-World Usage Experience
For large homes of more than 150 square metres, the Dreame L40s Pro Ultra offers the best combination of power (19,000 Pa) and autonomy (220 minutes). Its 4.5-litre clean water tank and 3.2-litre dust bag reduce maintenance frequency.
If you have pets, both the Dreame and the Saros 10R are superior options to the QV 35S. Their anti-tangle brushes, greater suction power and AI pet recognition facilitate coexistence. The Dreame also detects curtains, preventing the robot from getting tangled.
For homes with lots of low furniture, the Saros 10R with its 79.8 mm height accesses spaces impossible for the other models. Its ability to lift mops up to 22 mm also makes it ideal if you have thick carpets.
The QV 35S works well in small or medium flats without pets, with few obstacles and no need to pass under very low furniture. Its 10,000 Pa power is sufficient for hard floors and thin carpets, but falls short on thick carpets or abundant hair.
In maintenance, the Dreame and the Saros 10R require less intervention thanks to tray self-cleaning and automatic mop removal. The QV 35S needs manual tray cleaning and doesn't remove mops automatically.
Conclusion: Which to Choose?
Choose the Dreame L40s Pro Ultra if you're looking for maximum suction power (19,000 Pa) and the greatest autonomy (220 minutes). It's the best robot vacuum for large homes with pets, carpets and the need for thorough cleaning without frequent intervention. Its Roboswing system for extending mops and curtain detection are unique advantages. The base's larger tanks reduce maintenance to a minimum.
Choose the Roborock QV 35S if you have a small or medium flat without pets, are looking for a reliable solution without the need for advanced technology and value quality-price ratio. With 10,000 Pa it cleans hard floors and thin carpets well, although it falls short in features compared to its competitors. It's the most basic option in this comparison between high-end robot vacuums.
Choose the Roborock Saros 10R if you need to pass under low furniture (79.8 mm height), have thick carpets requiring mop lifting up to 22 mm, value mopping with warm water and want the most advanced navigation technology (StarSight 2.0). Its 6,400 mAh battery and DuoDivide system make it an excellent option for homes with pets seeking total autonomy and cutting-edge technology.
