The device uses disposable bags - you don't have to get yourself dirty emptying and cleaning it.
Devices with wider brush can clean your floors in less time.
The device can work longer without needing to be emptied.
The device has a longer hose which makes it easier to clean high places with an attachment, and it's less likely that the unit will tip over when doing so.
The powerheads bumper is protected so you don't knock the paint on baseboards or damage furniture when you bump into them.
A long cable ensures more freedom of movement.
Device automatically adjusts its height to clean all flooring types easily and efficiently.
All extra tools are stored on/in the device itself. It's convenient to have all tools in one place as you don't have to find a place to store them and they are right there when you need them.
The device is easier to store and to control. It's ideal for cleaning large areas.