This still depends on the condition of the wall and the local climate. If the wall is decayed and falls off, you can only remove it first and then fill it with lime or putty. In this case, latex paint is better. If the wall is in good condition and too dirty, it is recommended to choose wallpaper. Under normal circumstances, the price of wallpaper is definitely much cheaper than that of latex paint, and the construction of wallpaper is relatively simple and convenient.