Introduction
We are looking at three high-end robot vacuum cleaners that represent the most advanced in home cleaning technology. The Roborock S8 MaxV Ultra arrived in 2024 as one of the flagship models from the world's leading brand, whilst the Roborock Saros 20 landed in February 2026 with significant technical improvements. Completing this robot vacuum comparison is the Dreame X50 Ultra Blanca from 2025, a device that seeks to compete directly with high-end solutions at a more competitive price.
These three models are designed for users seeking complete automation in home cleaning. All incorporate multifunctional bases that manage both vacuuming and mopping autonomously, making them especially useful for medium and large homes where manual intervention is reduced to a minimum.
Power and Suction
The most striking difference between these models lies in their suction capacity. The Roborock S8 MaxV Ultra offers 10,000 Pa, a figure that at the time was more than sufficient for most homes. The Dreame X50 Ultra doubles this power with 20,000 Pa, which translates into better performance on carpets and in capturing fine particles.
The generational leap is clearly evident in the Roborock Saros 20, which reaches 36,000 Pa. This figure represents a substantial change in deep suction capacity, especially relevant in homes with medium or long pile carpets.
Regarding the brushing system, the Saros 20 opts for the DuoDivide Antienredos brush, specifically designed to prevent hair tangles. The other two models are equipped with a double rubber brush, also effective in this regard but with a different approach. All three incorporate main brush elevation during mopping, which prevents contaminating the freshly mopped floor.
The side brush presents important differences. Although all three models feature side extension to improve corner cleaning, only the Saros 20 and the Dreame X50 Ultra can raise this brush during mopping and have anti-tangle technology on it. The S8 MaxV Ultra lacks these two features.
Mopping
The mopping system shows notable evolution between generations. The Roborock S8 MaxV Ultra uses a vibratory mop with an additional mini side mop to get closer to edges. The later models, both the Saros 20 and the Dreame X50 Ultra, incorporate two rotating mops with full edge extension. The Dreame also adds RoboSwing movement, which allows the mop to reach under overhangs and furniture.
Mop elevation varies between the three: the S8 MaxV Ultra reaches 20 mm, the Saros 20 offers a range of 12 to 22 mm, and the Dreame X50 Ultra stays at 10.5 mm. These differences can be decisive in homes with high-pile carpets.
A distinguishing feature of the Saros 20 is its ability to mop with warm water, something that neither of the other two models offers. This function improves the removal of stuck-on stains and grease. All three detect dirt both on the mops and on the floor to adjust cleaning.
Automatic mop removal at the base is present in the Saros 20 and the Dreame X50 Ultra, allowing the robot to vacuum without dragging dry mops across the floor. The S8 MaxV Ultra does not incorporate this function.
Navigation System
All three devices use LiDAR navigation combined with dual artificial intelligence cameras and front 3D laser sensors. The fundamental difference lies in obstacle recognition capability. The S8 MaxV Ultra identifies 73 different types, a figure that at the time represented an important advance. The Dreame X50 Ultra expands this catalogue to 200 recognisable obstacles.
The Roborock Saros 20 makes a qualitative leap with its StarSight 2.0 system, capable of identifying up to 300 different obstacles. In practice, this translates into more precise navigation and less need for manual intervention to remove objects from the floor.
All recognise pets and have LED for night vision, as well as allowing remote camera access. However, only the Saros 20 and the Dreame X50 Ultra detect curtains, avoiding tangles that can be problematic.
The S8 MaxV Ultra runs on the RR Mason 11.0 processor, whilst the Dreame X50 Ultra incorporates AI Sage 13.0. The Saros 20 processor is not specified in the available technical data.
Autonomy and Battery
Battery capacity shows a clear evolution. The Roborock S8 MaxV Ultra is equipped with 5,200 mAh, sufficient for 180 minutes of autonomy. Both the Saros 20 and the Dreame X50 Ultra increase this capacity to 6,400 mAh. The Dreame also offers 180 minutes of continuous operation, although the exact autonomy of the Saros 20 is not specified.
This difference of 1,200 mAh can make a difference in large homes or in particularly demanding cleaning sessions where high suction power consumes more energy.
Smart Features
The ability to overcome obstacles presents notable differences. The S8 MaxV Ultra can negotiate steps up to 20 mm in height. The Saros 20 and the Dreame X50 Ultra incorporate more advanced systems for overcoming simple steps, although the technical information does not detail the exact height in millimetres for these models.
All three robots integrate their own voice assistant, as well as compatibility with Alexa and Google Home. This function allows you to control the robot using voice commands without needing to open the mobile app.
Multifunctional Cleaning Base
All three bases manage auto-emptying of the dust container, washing and drying of mops. Washing is carried out with hot water in all three cases, which improves mop hygiene. Drying also uses hot air in all models, speeding up the process and preventing bad odours.
Self-cleaning of the washing tray clearly differentiates the S8 MaxV Ultra from the rest. This model does not include this function, whilst the Saros 20 performs it with hot water and the Dreame X50 Ultra incorporates a third-generation system. Additionally, only the Dreame adds UV disinfection of the tray.
All three bases have a detergent tank to dispense product during mop washing. The dust bag capacity is 2.5 litres in both Roborock models, compared to 3.2 litres for the Dreame X50 Ultra.
Clean water tanks are 4 litres in both Roborock models and 4.5 litres in the Dreame. For dirty water, the S8 MaxV Ultra offers 3.5 litres, the Saros 20 stays at 3 litres and the Dreame reaches 4 litres. These differences can be relevant in large homes where the robot mops extensive surfaces without supervision.
Only the Dreame X50 Ultra offers an optional plumbing connection kit, which is purchased separately. None of the three models includes this connection integrated as standard.
Dimensions
The robot's height marks important functional differences. The Roborock S8 MaxV Ultra measures 103 mm, which may limit its access under some furniture. The Dreame X50 Ultra reduces this height to 89 mm, improving its ability to get under beds and sofas.
The Roborock Saros 20 stands out especially with just 79.8 mm in height, making it the lowest of the three and allowing access to spaces that the other models cannot reach. The diameter is practically identical in all: 353 mm in the Roborock models and 350 mm in the Dreame.
The bases also present variations. The S8 MaxV Ultra measures 409 mm wide, 470 mm high and 419 mm deep. The Saros 20 has a base of 381 mm wide, 488 mm high and 475 mm deep. The Dreame X50 Ultra is the narrowest at 340 mm wide, but also the tallest at 590.5 mm and 456.7 mm deep.
Real-World User Experience
For large homes, the Roborock Saros 20 and the Dreame X50 Ultra offer greater battery capacity, which reduces interruptions during cleaning. The Dreame's larger dust bag also means fewer manual emptying sessions in homes with lots of dirt.
In homes with pets, all three models are suitable thanks to their anti-tangle brushes. The greater suction power of the Saros 20 can make a difference in capturing hair embedded in carpets. The side brush elevation system of the Saros 20 and the Dreame X50 Ultra also prevents hair from being dispersed during mopping.
For those looking to get under low furniture, the Saros 20 with its 79.8 mm height represents a clear advantage. The Dreame X50 Ultra also improves on the S8 MaxV Ultra in this regard.
Total maintenance autonomy favours the Saros 20 and the Dreame X50 Ultra thanks to automatic mop removal and more advanced tray self-cleaning. The warm water of the Saros 20 provides an extra benefit in homes with young children or where greater hygiene is required in mopping.
Conclusion: Which One to Choose?
Choose the Roborock S8 MaxV Ultra if you're looking for a proven model from the leading brand with 20 mm mop elevation, useful for high-pile carpets. It's suitable for medium-sized homes where 10,000 Pa power is sufficient and you don't need to get under very low furniture. Its vibratory mop with side extension works well, although later systems have evolved.
Choose the Roborock Saros 20 if you prioritise maximum suction power with 36,000 Pa and the most advanced obstacle recognition on the market. Its height of just 79.8 mm makes it the best option for accessing under furniture, and the warm water for mopping provides better results on difficult stains. Automatic mop removal and hot water tray self-cleaning reduce maintenance. Ideal for large homes with pets and carpets.
Choose the Dreame X50 Ultra Blanca if you're looking for high-end features with competitive value for money. Its 20,000 Pa offers good balance, the 3.2-litre bag is the largest, and the 4-litre dirty water tank allows mopping more surface area without intervention. UV disinfection and the RoboSwing system add value, and the optional plumbing connection kit may be interesting for some users. Its height of 89 mm allows access to most spaces under furniture. A solid option for large homes seeking complete automation without reaching the price of the most advanced Roborock models.
