Nikon S3000 has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features Expeed C2 processor. On the other hand, Sony WX9 has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features BIONZ processor.
Below you can see the S3000 and WX9 sensor size comparison.
Nikon S3000 and Sony WX9 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 Nikon S3000 has 32% larger pixel area compared to Sony WX9, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.