Roomba i3 comparison to better models

s9 best cleaning
i3 lesser map control
i7 good features

iRobot Roomba i3 (3150) Wi-Fi Connected Robot Vacuum Vacuum - Wi-Fi Connected Mapping, Works with Alexa, Ideal for Pet Hair, Carpets Buy on Amazon

iRobot Roomba i7 (7150) Robot Vacuum- Wi-Fi Connected, Smart Mapping, Works with Alexa, Ideal for Pet Hair, Works With Clean Base Buy on Amazon

iRobot Roomba S9 (9150) Robot Vacuum- Wi-Fi Connected, Smart Mapping, Powerful Suction, Works with Alexa, Ideal for Pet Hair, Works With Clean Base Buy on Amazon

iRobot Authentic Replacement Parts- Clean Base Automatic Dirt Disposal, Compatible with Roomba i Series Robot Vacuums Only Buy on Amazon