Compare the iPhone 6s to the iPhone 7
Physical button, yes or no?
Home button iPhone 6s: a physical button
The iPhone 6s's home button is comparable to that of the iPhone 6 and 5s. It's a physical button that you can feel when pressing it down. Just like the home button found on the iPhone 7, Touch ID has been integrated into the button.
Home button iPhone 7: no physical button
It'll take some time getting used to: the iPhone 7's home button is no longer a button you can press. Instead, it feels like you're pressing down the entire lower half of the phone. That's because the iPhone 7 has an integrated vibration motor that starts working when you 'press' the button.
When it comes to design, the iPhone 6s and iPhone 7 can be considered twins. One difference that stands out to me is the placement of the antenna lines on the rear of the phone. On the iPhone 6 and 6s, they run centrally across the rear of the phone. On the iPhone 7, they no longer run along the back of the phone, but along the top and bottom of the phone. Because of this, I feel they've been incorporated much more subtly. Additionally, there are 2 new available colors. Gray (Space Gray) is no longer. Instead, you can now choose matte black or shiny black.
Design iPhone 6s: the old, familiar 'Space Gray'
For 3 years in a row, all iPhone models were available in the colors 'Space Gray:' the iPhone 5s, the iPhone 6, and the iPhone 6s. The iPhone 7 has now broken with this tradition.
Design iPhone 7: the camera bulge has been incorporated into the casing
Another difference with the iPhone 6s is the fact that the camera bulge has been incorporated into the rear of the phone. In the iPhone 6s, this is a separate part that's attached to the body of the phone.
An important addition, to me, is the inclusion of optical image stabilization on the iPhone 7. The iPhone 6s Plus already featured this function, but the smaller 6s didn't. This makes the iPhone 7 the first 4.7-inch iPhone to feature this function. The advantage of optical image stabilization is that your photos won't be blurry as quickly when you move the phone because the optical image stabilization compensates for any movements you make.
Without or with image stabilization?
Camera iPhone 6s: without optical image stabilization
No optical image stabilization for the iPhone 6s. This is only meant for the iPhone 6s Plus. This doesn't do away from the fact that the iPhone 6s has an excellent 12-megapixel camera. To me, the photos are very sharp and detailed.
Camera iPhone 7: with optical image stabilization
Both the iPhone 7 and iPhone 7 Plus feature optical image stabilization. The main difference with the iPhone 6 without optical image stabilization can be seen when I'm filming. The optical image stabilization compensates for any movements you make with the phone. This allows for much more stabilized movies.