Both Fujifilm XP120 and Nikon W300 have 16.0 MP resolution sensors but Fujifilm XP120's sensor is (1/2. ) and Nikon W300's sensor is 1/2.3 (6.17 x 4.55 mm ).
Since Nikon W300's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Fujifilm XP120.
Below you can see the XP120 and W300 sensor size comparison.
As seen above, Nikon W300 has a infx Larger sensor area than Fujifilm XP120. 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.