The good polished design. Awesome camera. Long battery life. Micro SD storage slot and water resistant The size, shape and general design of the Galaxy S7 means it's easier to hold and operate one-handed too. I could reach the other side of the screen with my thumb with far less strain, and it required little to no shuffling in the hand to move around the whole display.
The power/lock key on the right and volume rockers on the left also fall nicely under thumb and finger, although you'll still have to juggle the S7 a bit to reach thefingerprint scanner, which is embedded under the physical home key.