I'm planning to upgrade from the iPhone 5S that I've had for 3.5 years. The main reason I'm buying one is that I just purchased an Apple watch and wanted a newer phone to go with it, as mine is slow, has battery issues, and now seemed as good as ever of a time to upgrade. I'm really eyeing the iPhone 7, but I'm not sure if it is different or better enough from the 6S to grant spending the extra money on. For those of you who are more familiar with both of these models or have one of them, what would you suggest? Also, would one model be better suited for the Apple watch? Thanks.