If you’re content with the fact that the Samsung Galaxy S6 and S6 Edge are going to be updated to Android 7.0 Nougat, you’re probably not looking far enough. The question at this point should be whether Android 7.1.1 would arrive for your device.
For those who doubt that Samsung would be proactive with the newer update once it sees through version 7.0, don’t worry. You could always turn to LineageOS 14.1 which allows the Galaxy S6 (or any device on this list) to move further ahead on the Android road.
Now if you’re not familiar with the process of flashing a custom ROM, there are many tutorials available online, particularly from YouTube. The video below is a good example:
And in case you’re wondering what the big deal with Android 7.1.1 over 7.0 is, the newer version includes the comprehensive emoji set from the Pixel devices, direct access to GIFs from the keyboard on Google’s messaging apps, as well as app shortcuts that allow quick actions on apps via long-pressing their icons.