Roborock Q10V vs Dreame D20: LiDAR navigation wins in cluttered homes

The Roborock Q10V uses LiDAR and SLAM to map rooms and track its position, while the Dreame D20 relies on bump sensors and gyroscopic guesswork. In a home with furniture, toys, or tight corners, the LiDAR system actually cleans instead of wandering and missing spots. The bump-sensor approach works fine only in open, empty spaces.