I shoot in Adobe RGB 98, process in Prophoto (because it is larger than either Adobe RGB or SRGB), then save in SRGB for the web or printing services. It all depends on your workflow, I use a profiled monitor and printing to display my work at home and rely on whatever the viewer has on their system. As I understand it the order of gamut size from small to larger is SRGB, Adobe RGB 98, most DSLRs, Prophoto. Prophoto enncompases all of the red and blue with only a small amount of yellow being clipped when converting from the camera sensors native gamut.
It's best to shoot, process and display in the widest possible color space.
Will shoot for fame...fun...food... a heck I'll shoot anytime anywhere.