It makes sense comparing iRobot Roomba 650 vs iRobot Roomba 614 because they both are able to give some premium features. Based on our rating, Roomba 650 has the overall rating of 6.5 out of 10 versus 5.7 for Roomba 614.
A noticeable difference between two models is the size, which is 34 x 9.1/13.4 x 3.6 (D x H) cm/inches for the Roomba 650 and 43.1 x12.7/'17 x 5 (D x H) cm/inches for the Roomba 614. The weight of the Roomba 650 is 5.3/11.7 kg/lbs, and for the Roomba 614 it is 5.2/11.5 kg/lbs.
The iRobot Roomba 650 is better robot vacuum in this comparison. Check iRobot Roomba 650 price