I'll have to go with the iPhone 5. In my opinion, it has a very clean, aesthetic design and just about the right size so you can navigate it easily with your thumb. Although it takes a bit to get used to, iOS 7 adds even more to this design idea, let' say the idea of the iPhone in general: everything is simple. Of course, you'll have to accept the Apple universe; but it will reward you with a huge number of apps to make your life even easier. The retina display, the powerful processor and the wide range of third-party extensions makes it for me the best mobile phone on the market.