Another thing that we don't like about the Samsung Galaxy S6 is the app ecosystem that Android provides. There are two parts to this.
One, the Android versions of applications are often uglier than their iOS counterparts. In our experience, we've also found them to be buggier. They also tend to be slower to new features and occasionally they won't get a feature at all.
And two, many developers still release iOS applications before they release on Android. A recent example is Fallout Shelter. Bethesda's popular game arrived for iOS in June. It's still not available on Android and at best, it will arrive in August. That's two months after the iOS release. This is just one example.
Since we use both iPhone and Android, this isn't a problem. But most of you won't be using two phones. You'll be using a Galaxy S6 or something else. Something to think about if you're coming from iPhone or you want quick access to the best applications.