Introduction
Choosing between the Dreame L40s Pro Ultra, the Roborock Saros 20 and the Dreame X50 Ultra Blanca means entering the realm of high-end robot vacuum cleaners. All three models from 2025 and 2026 share a similar philosophy: complete multifunctional base station, advanced navigation with artificial intelligence and mopping capability with rotating mops. However, differences in suction power, battery life, robot height and tank capacity can make a real difference to the user experience.
The Dreame L40s Pro Ultra and the X50 Ultra Blanca represent two offerings from the same brand with distinct nuances, whilst the Roborock Saros 20 arrives with suction power that doubles its competitors and a StarSight 2.0 navigation system capable of recognising up to 300 obstacles. These are units designed for demanding homes, with pets and minimal maintenance requirements.
Power and Suction
The most striking difference appears in suction power. The Roborock Saros 20 delivers 36,000 Pa, a figure that practically doubles the 19,000 Pa of the Dreame L40s Pro Ultra and significantly exceeds the 20,000 Pa of the X50 Ultra Blanca. In homes with thick carpets or pets that shed a lot of hair, this difference can translate into deeper cleaning and fewer passes required.
All three units feature liftable anti-tangle main brushes. The Saros 20 opts for Roborock's DuoDivide Antienredos system, whilst the two Dreame models use the Doble Cepillo HyperStream. Both technologies are designed to minimise hair tangles, although the approach is different: the DuoDivide pushes hairs towards the centre for direct suction, whilst the HyperStream uses two brushes anchored at one end.
As for side brushes, all three models feature an extendable, liftable and anti-tangle brush. This combination allows better sweeping of corners and prevents the side brush from dragging dirt during mopping by lifting automatically.
Mopping
All mop with two rotating mops and have an extension to better reach edges. The Dreame L40s Pro Ultra and X50 Ultra Blanca add the Roboswing system, a movement that helps get the mop under furniture or overhangs. The Roborock Saros 20 does not specify this movement, although its mop is also extendable.
Mop lift makes a practical difference. The Saros 20 lifts between 12 and 22 mm, allowing it to better navigate medium-thickness carpets. The two Dreame models stay at 10.5 mm, sufficient for thin carpets but more limited on thick carpets.
The Roborock Saros 20 introduces warm water for floor mopping, whilst the Dreame models use cold water. Warm water can improve the dissolution of greasy or stuck-on stains. All three base stations wash the mops with hot water and dry them with hot air, ensuring hygienic maintenance without bad odours.
All three models automatically remove the mops at the base station when only vacuuming is needed, and detect dirt both on the mops and on the floor to adjust cleaning intensity or re-clean dirtier areas.
Navigation System
The Dreame L40s Pro Ultra features a traditional LiDAR turret, the X50 Ultra Blanca uses retractable LiDAR and the Roborock Saros 20 is equipped with the StarSight 2.0 system. All three incorporate dual cameras with artificial intelligence, front 3D laser sensor, LED for night vision and remote camera access.
Obstacle recognition capability varies: 180 objects on the L40s Pro Ultra, 200 on the X50 Ultra Blanca and 300 on the Saros 20. In practice, this means the Roborock can identify and avoid more types of objects, reducing the risk of getting stuck or dragging unwanted items.
All recognise pets and curtains, useful features to avoid disturbing animals and not getting tangled in textiles. The Dreame X50 Ultra Blanca specifies the AI Sage 13.0 processor, whilst the other two do not detail the specific chip.
Battery Life and Battery
The Roborock Saros 20 and Dreame X50 Ultra Blanca share a 6,400 mAh battery, higher than the 5,200 mAh of the L40s Pro Ultra. However, the L40s Pro Ultra claims 220 minutes of battery life, the X50 Ultra Blanca 180 minutes and the Saros 20 does not specify this figure.
The higher suction power of the Saros 20 may consume more battery in maximum mode, although in standard mode the 6,400 mAh capacity should offer ample battery life for large homes. The L40s Pro Ultra, despite having less capacity, claims more operating minutes, probably because its suction power is lower and energy consumption more efficient.
For homes over 150 m², it's worth considering the claimed battery life and battery capacity. The L40s Pro Ultra offers more minutes on paper, but the X50 Ultra Blanca and Saros 20 have more energy reserve for consumption peaks.
Smart Features
All three robots overcome simple thresholds, without specifying exact height in the table. None features a robotic arm, but all include their own voice assistant and compatibility with Alexa and Google Home. This allows voice control of the robot and receiving information about cleaning status without needing to open the app.
Multifunctional Cleaning Base Station
All three base stations perform auto-emptying of the dust bin, mop washing with hot water, drying with hot air and self-cleaning of the washing tray. The Dreame X50 Ultra Blanca adds UV disinfection, absent in the L40s Pro Ultra and Saros 20. This feature can provide peace of mind in homes where hygiene is a priority.
The dust bag capacity is 3.2 litres in both Dreame models and 2.5 litres in the Roborock. This translates to fewer bag changes with the Dreame models, especially in homes with lots of dust or pets. The clean water tanks are 4.5 litres in the Dreame models and 4 litres in the Saros 20; the dirty water tanks are 4 litres in the Dreame models and 3 litres in the Roborock.
The Dreame L40s Pro Ultra and X50 Ultra Blanca offer an optional plumbing connection kit, purchased separately. The Saros 20 does not have this option. Although it's an additional accessory, it can be convenient for those seeking total autonomy without manually refilling or emptying tanks.
Dimensions
The Roborock Saros 20 stands out for its height of 79.8 mm, the lowest of the three. The Dreame X50 Ultra Blanca measures 89 mm and the L40s Pro Ultra reaches 103.8 mm. This difference is relevant for passing under sofas, beds or low furniture. The Saros 20 accesses spaces where the other two cannot enter.
The diameter is similar in all: 350 mm in the Dreame models and 353 mm in the Roborock. The Dreame base stations measure 340 mm wide, 590.5 mm high and 456.7 mm deep. The Saros 20 base station is wider (381 mm) and deeper (475 mm), but less tall (488 mm). It's advisable to measure the available space before deciding, especially if the base station goes in a cupboard or tight corner.
Real-world user experience
In large homes with carpets and pets, the Roborock Saros 20 offers clear advantages: higher suction power, more battery capacity and superior mop lift. Its reduced height allows it to clean under furniture where the other two cannot reach. Recognition of 300 obstacles provides additional security in homes with many objects on the floor.
The Dreame L40s Pro Ultra balances power and battery life with 220 claimed minutes, suitable for large surfaces without very thick carpets. Its base station has greater dust and water capacity than the Saros 20, reducing maintenance frequency. The Roboswing system can make a difference in kitchens with protruding skirting boards or low furniture.
The Dreame X50 Ultra Blanca sits between the previous two in height (89 mm) and adds UV disinfection in the base station. Its AI Sage 13.0 processor and recognition of 200 obstacles offer a good balance. The 6,400 mAh battery and tank capacity similar to the L40s Pro Ultra make it a versatile option for homes that value hygiene and autonomy.
For hard floors and parquet, all three models mop effectively thanks to automatic mop washing and dirt detection. The warm water of the Saros 20 can improve results on difficult stains. On carpets, the 36,000 Pa power of the Roborock makes a difference compared to the 19,000-20,000 Pa of the Dreame models.
Conclusion: Which to choose?
Choose the Dreame L40s Pro Ultra if you're looking for claimed battery life of 220 minutes, a base station with greater dust capacity (3.2 litres) and water, and you value the Roboswing system to reach under furniture. It's a balanced option for large homes without very thick carpets, with less frequent maintenance thanks to generous tanks.
Choose the Roborock Saros 20 if you need maximum suction power (36,000 Pa), minimum height to pass under low furniture (79.8 mm) and superior mop lift (12-22 mm). Its recognition of 300 obstacles and warm water for mopping make it the most advanced option for homes with thick carpets, demanding pets and complicated spaces.
Choose the Dreame X50 Ultra Blanca if you prioritise hygiene with UV disinfection, intermediate height (89 mm) to pass under most furniture and want a 6,400 mAh battery with generous tank capacity. The AI Sage 13.0 processor and recognition of 200 obstacles offer a middle ground between the other two models, suitable for homes seeking advanced technology without sacrificing tank capacity.
