You can't go wrong with either the Moto X or the Droid Turbo. They're two of the best Android phones ever made. But unless you absolutely need that extra battery life, you should buy the Moto X.
The Droid Turbo is like a Moto X on steroids. So even though it wins on individual features, the Droid Turbo's enhancements aren't really that noticeable. The Moto X's superior camera and design will make you happier in the long run.
