Great for avid readers — The larger screen size is paradise for those of you who read books or articles frequently on your smartphone.
More comfortable typing — Typing longer emails or notes on a 4-inch screen isn't a pleasant experience. On the iPhone, the keyboard takes up half of the screen if you're typing in landscape orientation. Drafting an email on a device as big as the iPhone 6 Plus, however, is much easier, especially with Apple's new expanded keyboard for the screen size, which includes shortcuts for frequently used features like copy and paste.
More room for big text — Smartphone squinters, this is your salvation. A lot of people I know make their smartphone's text bigger to give their weary eyes a break. On a smaller 4-inch screen, you'll only get two lines of limited text at a time in iMessage if the font is made larger. A bigger screen size will allow you to see more text at once, without having to compromise font size.
Amazing screen resolution — Typically, phablets have higher resolution than smaller smartphones. The iPhone 6 Plus has a new display called "Retina HD" (1,920 x 1,080), which offers more pixels per inch and higher contrast. The Galaxy Note 4 also has an incredible 1,440 x 2,560 super AMOLED display. A high-definition screen is well-suited for quality video viewing.