Nikon AW130 has a
16.0MP 1/2.3' (6.17 x 4.55 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 AW130 and SX270 HS sensor size comparison.
Nikon AW130 and Canon SX270 HS 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 SX270 HS has 32% larger pixel area (2.34µm2 vs 1.76µm2) compared to Nikon AW130, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.