Digital Pearl White - higher gain increases brightness, image resolution and shadow detail. Special coatings increases perceived contrast.

Standard Matte White - gain of 1.0 creates a dull image relative to a specifically designed digital white projector  screen.

Digital Pearl White screens are designed for light controlled rooms (ie: you are able to darken the room at will with heavy curtains or blinds), or where viewing will mainly occur at night.  The bright, white surface efficiently reflects the image back to the audience offering a higher gain than the industry standard of 1.0.  Standard matte white fabric/PVC surfaces are typically less efficient at reflecting back the image. On most of them you can clearly see the image shining through the material.  A brighter image resolves more image detail, allows a bigger picture to be projected and alternatively (depending on your projector hardware), allows a more economical lamp power setting to be employed.