Both cameras are excellent, however the Galaxy S7/Note 7 camera is slightly better. As for objectivity vs subjectivity, the S7 sensor is larger and uses a larger aperture compared to the iPhone 7
Check out iPhone 7 + camera portrait review. Something galaxy s range cannot offer.
http://m.imore.com/camera-tests-iphone-7-plus-portrait-mode-vs-canon-rebel-dslr