electing the right diffuser is largely based on the size of the area you intend to use the device in. For example, if you are diffusing oils in your office/desk area, the pocket diffuser is the perfect size. In a bedroom, the room diffuser would be the most appropriate selection. For larger rooms like living rooms, classrooms, stores, etc. you ll want to choose the larger, more powerful vaporizer.
The pocket diffuser is a battery operated, portable unit that utilizes a fan to disperse the essential oils. The room diffuser is a plug-in unit that uses low levels of heat to volatilize the essential oils. The vaporizer is sort of a hybrid of the two being a plug-in unit with a fan for dispersion.
The pocket diffuser and room diffuser both use pads unique to their design while the vaporizor requires a filter.