The Samsung Galaxy S7 and the iPhone 6S are both great handsets but there are some reasons why the Samsung device wins.
The first reason why the Samsung Galaxy S7 comes out in front of the iPhone 6S is that it offers two ways in which you can save battery. It comes with the standard and ultra-power saving options. If you use the latter then all functions stop that are not considered to be essential. This means that from just a few percent left on the battery you get hours of use.
The Samsung Galaxy S7 comes with better reminder notifications. This means that if you go into settings and choose to be reminded at intervals you will never forget the reminder until you have read it.
The Samsung Galaxy S7 is a big handset but you can enable one handed mode if you head into settings and choose this. This will shrink down the display if you hit the home button three times and the display shrinks into the corner of the display.