6+ has better battery life because the battery is bigger. No regrets at all. For months my wife said she would get the 6 because the + is too big. I finally convinced her otherwise and she couldn't be happier with the 6+ and very glad she went with it. In fact, she got rid of her iPad mini because she now does everything on the phone. Looking at the the 5S and previous models makes me shudder and wonder how I ever got by on that tiny screen.