I put depends. I shoot in RAW and my camera doesn't use a standard colorspace.
I do most of my work in Lightroom, which uses ProPhoto RGB. It has a very wide gamut, so I don't have any clipping problems.
When I generate JPGs for display online, I convert to sRGB. I do this because some browsers are not colorspace aware and sRGB tends to look best on them.
When I work in PS, I usually use Adobe RGB. I should probably switch to Pro Photo, but I haven't bothered.