For now anyway ...
sRGB is somewhat better for web since its a current standard and as of now versions of Explorer and xxx dont reconize color space {FireFox and some others do ...}.
aRGB is somewhat better for prints but does depend on lab or printer profiles.
Effect intended is also important and flatter can be better.
Universal "always" rules limit creativity and are often bad thinking.
BUT ... Dont forget other things like file color temp compression saturation brightness vibrance clarity CURVES etc.
This often make a bigger difference on many sites.
If u shoot in JPEG - better to open it as RAW and adjust there ...
Shooting RAW is better tho.
Your background will also influence the picture by playing games with your mind and eye ...
so will drugs and other nasty things !!
http://www.cambridgeincolour.com/tut...obeRGB1998.htm
EL