Answer:
The U80 Pet, U90 Vision, and U100 Laser differ from each other primarily in navigation. The U80 has SLAM mapping (it remembers where it has and has not been), the U90 has VSLAM-mapping (it uses a camera to build a map), and the U100 has laser lidar (it creates an accurate map of the room).
The robots, therefore, have different functionality of the mobile app. For example, the U90 and U100 can draw virtual walls, while the u80 does not.