The j7 has an advanced navigation system – iAdapt 3.0 allows to build more efficient cleaning algorithms and precisely avoid pet messes, cords, and socks. Moreover, j7 has an intelligent mapping system to create maps of your home where you can set Keep Out Zones. Also, the j7 has a more powerful battery, 2210 mAh, allowing it to work for up to 90 minutes. So, if you want a smart robot, we recommend the j7.