The sensors are the same size. Apertures are pretty close - neither is particularly good. The biggest difference is that the Samsung is 18x zoom (and therefore a larger camera because of the lens) and the Canon is 5x zoom.
What I couldn't find is what the apertures are at various focal lengths. They start at 2.8 and end at about 5.8 or so.
If size is more important, get the Canon. If zoom reach is more important, get the Samsung.
Those prices are crazy cheap, though!