Depends on the type of game, but I love maps for displacement games, or games where people live close to each other, just to get a more visual idea about who your neighbors are. But I'm a very visual person, so any descriptions and pictures of the locations/maps I can get are helpful to me, and I have used both in my games before. Depending on the game, I might even go so far as to say that I'm more interested in a game if the mods do put the effort into maps/pictures, because it shows you've taken the time to really plan out where these characters live.