Much depends on your intent and how the internal items scale. For example, if I display a picture of your head full screen, then move from a normal monitor to a wide screen monitor, your head will likely be stretched. For this reason, I always try to scale graphics so that the graphic maintains its aspect ration. Assume a 4x6 photo, which has an aspect ration of 2:3. If my monitor is 1024x768, the ratio is 4:3, a resolution of 1920x1200 is 8:5.