Larger Display with 1080p
The iPhone 6 comes with a 4.7-inch Retina Display but unlike the iPhone 6 Plus, it doesn't come with 1080p resolution. If you want the biggest and best iPhone display you have to buy the iPhone 6. Or the iPhone 6s Plus if and when it arrives later this year.
If you're looking to move from Apple's 4.7-inch display to its 5.5-inch display, you should be able to do just that with the iPhone 6s Plus. The iPhone 6s Plus is rumored to have a 4.7-inch display which is the same size as the iPhone 6 Plus display.
Apple reportedly won't be shifting to Quad HD or Ultra HD resolution though. Instead, the iPhone 6s Plus will supposedly keep a similar resolution which means that it should keep support for 1080p. Again, that's something the iPhone 6 doesn't have.
If you decide that you don't want the larger screen, there should also be an iPhone 6s with a 4.7-inch Retina Display.
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