Tons of High Quality Apps
Now that we're nearly 10 months removed from the release of the iPhone 6, most apps now support the big screens. Most applications look absolutely stunning on the iPhone 6's Retina Display. In some cases, much better than their Android counterparts.
It's also important to point out that the iPhone typically gets the hottest applications before Android. Getting early access like that might not sound like much but go talk to an Android user that has to wait until August for Fallout Shelter to come out.
Apps look and feel great on the iPhone 6's big display and often, you'll be first to the best new applications on the planet. That's a winning combination.