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Introduction
In the 2025 robot vacuum market, two models stand out for their differentiated value proposition: the Dreame L40s Pro Ultra and the Roborock QV 35S. Both represent different approaches within their respective brands, with the Dreame L40s Pro Ultra being a high-end model with advanced technology, whilst the Roborock QV 35S positions itself as a more accessible option without sacrificing essential features.
This robot vacuum comparison analyses in depth the technical characteristics of both models to help you decide which robot vacuum best suits your needs and budget. We will examine everything from suction power to navigation systems, including mopping capabilities and battery life.
Power and Suction
The most notable difference between these two robot vacuums lies in their suction power. The Dreame L40s Pro Ultra robot vacuum offers an impressive 19000 Pa of power with its Turbo Force 6 system, almost doubling the 10000 Pa of the Roborock QV 35S. This difference translates into superior capability for extracting embedded dirt from carpets and vacuuming heavier particles.
Regarding the main brush design, the Dreame L40s Pro Ultra incorporates a dual anti-tangle brush system, especially useful for homes with pets or people with long hair. Meanwhile, the Roborock QV 35S features a simple silicone brush, which although effective on hard surfaces, may not be as efficient on carpets or with long hair.
Both models integrate dust bins of similar capacity: 300 ml in the Dreame and 330 ml in the Roborock, which allows for several cleaning sessions before requiring manual emptying if the auto-empty base is not used.
Mopping
Both robot vacuums include a mopping function with 80 ml water tanks, an identical capacity that allows mopping medium-sized surfaces without needing to constantly refill. However, the available specifications do not detail advanced mopping systems such as extendable mops, RoboSwing technology or mop lifting in either of the two models in the data provided.
The main difference in the mopping system maintenance lies in the self-cleaning of the washing tray. The Dreame L40s Pro Ultra incorporates a third-generation self-cleaning system, whilst the Roborock QV 35S uses a watertight system but without automated self-cleaning of the tray, which requires greater manual intervention to maintain system hygiene.
Navigation System
Regarding intelligent navigation, both robot vacuums incorporate cleaning systems with artificial intelligence, although with different levels of sophistication. The Dreame robot vacuum features CleanGenius 2.0, an advanced system that includes AI-powered stain recognition, allowing the robot to identify areas requiring greater attention and automatically adjust its cleaning pattern.
The Roborock QV 35S integrates SmartPlan basic, a simpler but effective intelligent planning system for home navigation and mapping. However, it does not have AI-powered stain recognition, which means it cannot automatically identify areas needing intensive cleaning.
This difference in navigation systems translates into a more autonomous user experience with the Dreame L40s Pro Ultra, which requires less manual intervention to obtain optimal results compared to the Roborock QV 35S.
Autonomy and Battery
Both models share the same battery capacity of 5200 mAh, a robust figure that guarantees extended cleaning sessions. However, the autonomy differs significantly between both robot vacuums.
The Dreame L40s Pro Ultra offers up to 220 minutes of continuous operation, exceeding the 180 minutes of the Roborock QV 35S. This 40-minute difference can be decisive in large homes or when multiple intensive cleaning passes are required. The Dreame's greater autonomy is especially advantageous considering its higher suction power, which normally consumes more energy.
With these autonomies, the Dreame robot vacuum can cover larger surfaces in a single session, whilst the Roborock QV 35S is more suitable for medium-sized homes where its autonomy is sufficient.
Smart Features
In the obstacle-overcoming department, the Dreame L40s Pro Ultra stands out with its Extra Wheels 1.0 system, capable of overcoming height differences between 22 and 40 mm. This capability allows it to navigate thick carpets, door thresholds and small obstacles with ease, accessing more areas of the home without getting stuck.
The Roborock QV 35S can overcome obstacles up to 20 mm, a respectable figure that covers most domestic situations such as medium-thickness carpets and small height differences, although with less margin than its competitor.
Neither of the two robot vacuums incorporates a robotic arm, a technology usually reserved for ultra-premium range models intended for specialised cleaning tasks.
Multifunction Cleaning Base
Both models are compatible with multifunction cleaning bases that automate much of the robot's maintenance. The main difference lies in the self-cleaning system of the tray where the mops are washed.
The Dreame L40s Pro Ultra incorporates a third-generation tray self-cleaning system, which automatically cleans the area where the mops are washed, reducing the accumulation of dirt and bad odours. This system requires less user intervention to maintain base hygiene.
The Roborock QV 35S uses a watertight design that prevents leaks, but does not include automated self-cleaning of the washing tray, which means the user will need to manually clean this area more frequently to maintain optimal hygienic conditions.
Dimensions
The dimensions of both robot vacuums are very similar, which facilitates their direct comparison. The Dreame L40s Pro Ultra measures 350 mm in diameter and 103.8 mm in height, whilst the Roborock QV 35S has 353 mm in diameter and 96.5 mm in height.
The most relevant difference is found in the height: the Roborock QV 35S is 7.3 mm lower, which can be decisive for accessing under low-height furniture such as sofas, low beds or certain types of wardrobes. If your home has furniture with reduced spaces underneath, this difference can determine which areas each robot can clean autonomously.
The practically identical diameter means that both will navigate with similar ease through corridors and narrow spaces, without significant advantages of one over the other in this aspect.
Conclusion: Which One to Choose?
The choice between the Dreame L40s Pro Ultra and the Roborock QV 35S depends fundamentally on your priorities and budget:
- Choose the Dreame L40s Pro Ultra if you're looking for maximum suction power (19000 Pa), greater autonomy (220 minutes), dual anti-tangle brush system ideal for pets, intelligent AI-powered stain recognition, and less maintenance thanks to the third-generation tray self-cleaning. It's the best robot vacuum 2025 for large homes, with pets, or users who prioritise advanced technology and minimal manual intervention.
- The Roborock QV 35S is ideal for those seeking a balanced solution with good power (10000 Pa), lower height to access under low furniture (96.5 mm), and a presumably more accessible price. It's perfect for medium-sized homes without long-haired pets, where value for money is a priority over the most advanced features.
In this robot vacuum comparison, the Dreame L40s Pro Ultra positions itself as the premium option with cutting-edge technology, whilst the Roborock QV 35S offers solid performance in essential features. Both are excellent robot vacuums 2025, but aimed at different user profiles according to specific needs and available budget.
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