Roborock Saros 20 Flow vs Roborock Saros 20 Sonic: Which to Buy

The Roborock Saros 20 Sonic is the better robot vacuum overall, rated 4.2 to 3.8. The Roborock Saros 20 Sonic leads on dock. The Roborock Saros 20 Flow wins on mopping.

Higher rated

Roborock Saros 20 Sonic

#22 in Self-cleaning dock4.2Full review

For homes that want the Saros 20’s slim build and threshold climbing with a retractable LiDAR and a sonic mop.

Amazon

Roborock Saros 20 Flow

#49 in Self-cleaning dock3.8Full review

For homes with lots of hard floor that want a roller mop with flagship suction and threshold climbing.

Amazon $1,699.99

$1,699.99

Prices were last checked October 26, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.

Which should you buy?

Choose the Roborock Saros 20 Sonic for dock (Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent, optional water hookup vs Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent).
Choose the Roborock Saros 20 Flow for mopping (Roller, lifts 15 mm, extends to edges vs Vibrating pad, leaves its mop at the dock for carpet).

Scores side by side

Each factor is scored 0-100 against the same fixed reference points for every self-cleaning dock robot vacuum; a clear win is highlighted. How we rank explains each one.

Factor weight	Roborock Saros 20 Sonic	Roborock Saros 20 Flow
Overall rating	4.2/5	3.8/5
Cleaning 30%	82 measured 92% of sand from carpet, 77.8% of pet hair, no hair tangled	74 measured 89% of sand from carpet, 76.2% of pet hair, no hair tangled
Value 25%	50 no current price (neutral score used)	3 $1,700
Dock 20%	100 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent, optional water hookup	90 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent
Navigation 15%	100 LiDAR + camera	100 LiDAR + camera
Mopping 10%	46 Vibrating pad, leaves its mop at the dock for carpet	95 Roller, lifts 15 mm, extends to edges

Independent tests

Roborock Saros 20 Sonic

Tested by	Carpet deep clean	Pet hair	Hair tangle (0 = none)	Area per charge	Conditions
Vacuum Wars	92%	77.8%	0	1,225 sq ft	Embedded sand in medium-pile carpet; flattened 2.5 in pet hair on carpet, two runs; 7 in hair tangle on hard floor (0 = none wrapped).