A garden hose reel is a device that typically includes a cylindrical spool to neatly wind and store the garden hose. It usually has a handle to manually reel in the hose and keep it organized. On the other hand, a garden hose hanger is a simple hook or holder mounted on a wall or fence to hang the garden hose. The key difference is that a hose reel allows for the hose to be wound up inside a container, while a hanger simply provides a place to hang the hose when not in use.