Lightroom is a software intended for photographers. It is also built in such a way that the process job begins to import the files from the camera, cataloging, sorting, processing (development) and export the images readiness - process effective work designed for photographers, and to work with a large amount of photographs. Also the process of adaptation and development speaks the language of photographers with the values of exposure, white balance, חיודוד and assorted filters and effects never the copy.
Photoshop however is software that is designed to works graphic at all, and not necessarily just image processing, is a software with a lot of capabilities and photographers are just a small part of