Nikon S33 has a
13.0MP 1/3.1' (4.7 x 3.5 mm ) sized CMOS sensor . On the other hand, Canon SX270 HS has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features Digic 6 processor.
Below you can see the S33 and SX270 HS sensor size comparison.
As seen above, Canon SX270 HS has a 1.7x Larger sensor area than Nikon S33. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.