The present review is aimed to compare two robot vacuums - iRobot Roomba S9 vs iRobot Roomba i7 7150. Based on our rating, Roomba S9 has the overall rating of 9 out of 10 versus 7.7 for Roomba i7 7150.
A noticeable difference between two models is the size, which is 30.9 x 8.8/12.2 x 3.5 (D x H) cm/inches for the Roomba S9 and 33.7 x 9.1/13.3 x 3.6 (D x H) cm/inches for the Roomba i7 7150. The weight of the Roomba S9 is 3.6/8.1 kg/lbs, and for the Roomba i7 7150 it is 3.3/7.4 kg/lbs.
The iRobot Roomba S9 is better robot vacuum in this comparison. Check iRobot Roomba S9 price