In DigitalCameraInfo’s Nikon Coolpix S630 vs Canon Powershot SD780 IS / IXUS 100 IS comparison, Tim Barribeau wrote:
In terms of performance, the Nikon scored higher in most still image tests, but the Canon has the edge in video mode. The Canon scored slightly better for resolution due to higher image sharpness, but it had worse distortion. The image stabilization system was slightly more effective on the Canon, as was the shot to shot speed. Its real advantage was in video mode, where the high definition capabilities blew the Nikon out of the water, and the S630’s lack of manual white balance controls led to very poor video color. However for pure still image quality, we lean toward the Nikon.