It makes sense comparing Neato Botvac D6 vs iRobot Roomba S9 because they both are able to give some premium features. Based on our rating, both robot vacuums have the same overall rating of 9.
A noticeable difference between two models is the size, which is 33.5 x 10/13.2 x 3.9 (D x H) cm/inches for the Botvac D6 and 30.9 x 8.8/12.2 x 3.5 (D x H) cm/inches for the Roomba S9. The weight of the Botvac D6 is 3.4/7.5 kg/lbs, and for the Roomba S9 it is 3.6/8.1 kg/lbs.
The Neato Botvac D6 is better robot vacuums in this comparison. Check Neato Botvac D6 price