UPDATED the image with a better comparison!
It might not be exactly representative, because the map is different from up to down. But basically, the upper screenshot has no background art (behind the isometric map) while the screenshot on the bottom has it. They're generic background art to represent the zone/location/area.
Which one looks better? I have actually also another idea, to have some sort of black shroud around the map so it gets more focus, might try to do a mockup later if I have time