Why use equal-area maps?

Given the choices of either shape distortion or areal distortion or both, the equal-area projections were chosen for the EASE-Grids because they minimized the amount of distortion over the hemispheric and global scale being portrayed. One convenient side effect of this choice is that calculations of areal statistics are reduced to simply summing pixels and multiplying by a constant area per pixel, so the acronym, EASE takes on a secondary meaning, as in easy to use. For more information, see the EASE-Grid: A Versatile Set of Equal-Area Projections and Grids Web page.