Another consideration is the projection of the map.  As you know, the world is round so the only map that's 100 percent accurate is a globe. All the flat maps have to make some compromises to depict a round world on a flat surface. The old Mercator projection goes back to the 1500's. It grossly distorts the size of land masses near the poles. Look at the "Antique Look" map in the fifth row above. Greenland is NOT bigger than the United States. The other extreme is the Peters Projection.  On this map all the land masses have the correct size in proportion to one another, but it distorts North-South distances. All the rest of the maps use a projection that strikes a balance between size distortion and distance distortion. The National Geographic maps all use the Tripp-Winkel projection which shows the world as an oval. But it requires them to put some sort of little inset map in each corner. Most diehard Geographers swear by this projection but I don't think it's as decorative.  My favorite is the Equal-Albers projection which you'll find in the first two maps on the first row.
One final consideration is the ocean color. The more decorative maps all tend to have a beige/sepia/parchment colored ocean. This may be important to you if your priority is decoration instead of reference. Remember, the world is 73% water covered. So therefore 73 percent of your map will be the same color. My experience is that Decorators like the sepia oceans, travelers and adventurers like the blue ocean maps..