Style and Appearance
I’ll start by discussing faux finishes in a little more detail here. The word “faux” means fake, so a faux finish is a finish that imitates the real thing. These finishes can include marble, granite, limestone, or an “aged” finish you would find in say a 17th century tuscan farmhouse. Both the depth and feel of these finishes are best accomplished with paint and/or plaster. Decorative finishes, however, encompass an infinite amount of colors and patterns. Painting, certainly does give more depth to any finish but that may not be that important to you, keeping in mind the over-all look you are trying to achieve.
There are certain styles that lend themselves much better to paint than wallpaper. These include any Olde World or plaster-type finish, frescoes, Tuscan, folk art, or anything where a time-worn look is desired. Wallpaper works well for such styles as French (toile), English styles, and many contemporary styles.
When deciding on wallpaper or paint, make sure you consider appearance. Any small wallpaper mural you purchase, where edges are exposed, should be considered temporary. If you decide to buy a wallpaper “window”, consider adding a simple frame to cover the edges and integrate it into the room. A painted mural will always have the edge over wallpaper murals in appearance. Since cost is comparable, a painted mural is the better investment.