11% cheaper ≈ US$160
- Suction power 4,000 Pa vs 3,000 Pa
- Runtime 180 min vs 150 min
- Cleaning area per charge 250 m² vs 120 m²
- Threshold climbing 17 mm vs 18 mm
- Height 97 mm vs 93 mm
10 robot vacuum and mop combos at a similar price that compete with the X21 SW — what each does better, what it gives up and how the price compares.