Adobe RGB is irrelevant for real photography. sRGB gives better (more consistent) results and the same, or brighter, colors.
Using Adobe RGB is one of the leading causes of colors not matching between monitor and print.
sRGB is the world's default color space. Use it and everything looks great everywhere, all the time.
Adobe RGB should never be used unless you really know what you're doing and do all your printing yourself. If you really know what you're doing and working in publishing, go right ahead and use it. If you have to ask, don't even try it.