There is no Powershot XS. If I remember correctly, do you mean a XS 10? You are wanting to know if it or a XA 10 HD camcorder can do better in stills? Or do better in video?
By far and away the Powershot will be easier to do stills with and likely produce better work. And I suspect the XA 10 HD will trash the Powershot in video.
You far are better off using the camera that is meant for its particular function.
EB
EOS 1D, EOS 1D MK IIn, EOS 1D MK III, EOS 1Ds MK III, EOS 1D MK IV and EOS 1DX and many lenses.
