Neil has been hanging on to the iPhone 6S, but he decided to get the iPhone 7 anyway. Leo took his on a cruise along with his Leica camera and he says it competed well with it. Neil wants to know how to get the most out of his camera on the iPhone. Leo says that the built-in Apple camera app has matured to the point that it's the best of the bunch now. Leo doesn't see the need for other camera apps. The built-in app will always have the edge over the others because it will be the first, and perhaps the only, to have the new features that Apple implements. For instance, it will likely be the only app that will take advantage of Apple's new upcoming 'Portrait' mode.
If Neil wants a third party app to try, though, Camera+ is a good option.