The Xiaomi S40's LiDAR navigation leaves the H40's gyroscopic system in the dust

The choice between the Xiaomi S40 and H40 really comes down to whether you want actual room mapping or a robot that just guesses where it is. The S40 uses LiDAR to build a real-time map of your home, so it knows exactly where every room is and can clean them in order. The H40 relies on gyroscopic sensors that approximate movement — it’ll get the job done, but it won’t handle complex layouts nearly as well.