Both Nikon S3600 and YI M1 have 20.0 MP resolution sensors but Nikon S3600's sensor is 1/2.3" (6.17 x 4.55 mm ) and YI M1's sensor is Four Thirds (17.3 x 13 mm ).
Since YI M1'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 Nikon S3600.
Below you can see the S3600 and M1 sensor size comparison.
As seen above, YI M1 has a 8.0x Larger sensor area than Nikon S3600. 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.