If you’re in the market for a robot vacuum and want to invest in the best, you are probably considering the Xiaomi Mi Robot and roborock S4. Based on our rating, Mi Robot has the overall rating of 8.5 out of 10 versus 9 for S4.
A noticeable difference between two models is the size, which is 35.4 x 9.6/13.6 x 3.8 (D x H) cm/inches for the Mi Robot and 35 x 9.1/13.8 x 3.6 (D x H) cm/inches for the S4. The weight of the Mi Robot is 3.8/8.4 kg/lbs, and for the S4 it is 3.1/7 kg/lbs.
The roborock S4 is better robot vacuum in this comparison. Check roborock S4 price