iPad and iPhone 6 Plus: Which One to Choose?

Some users might say, 5.5 and 7.9 inches of screen size, there are still some gaps, but for users who purchase psychology, is still not a small impact, ask when you have iPhone6plus, you will buy iPad mini yet? Apple also deliberately stressed in particular the changes in their systems, intends to highlight the iPhone6plus flat effect can be achieved things, through this conference, it has become well known, so Apple is intentionally vague large-screen phone and tablet concept. As a result Apple's own iPad mini is not on the difficulty in marketing? what is Apple doing and why?