I have ultimately decided to go with the iPhone 6 Plus. My rationale is simply that the two factors I care most about: camera and battery life, are slightly better on the bigger device. But I’m not entirely sold. I have a sneaking suspicion that I may change my mind when I start to use the thing day-to-day.
I really want to go with the iPhone 6+ for the same reasons, but I have a hard time justifying the massive size of the thing. I’m thinking the Apple Watch will make it a more reasonable purchase since you will be able to leave the phone stashed away more often.