Canon SX210 IS has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features Digic 4 processor. On the other hand, Nikon S6300 has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor .
Below you can see the SX210 IS and S6300 sensor size comparison.
Canon SX210 IS and Nikon S6300 have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture. On the other hand, since Canon SX210 IS has 14% larger pixel area compared to Nikon S6300, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.