I've thought a good deal about upgrading my almost 4-year-old iPhone 4S with a 2015 Moto X Pure. There's a lot about the Pure to like, though I would have to give up the simplicity of integration that I've enjoyed among my iPhone, iPad Air, and retina MacBook Pro. Still, the Pure's price tag is tempting to my budget-conscious mind. Also, while the Pure is not as fine a phone as the 6S should be, it seems good enough for my needs. I've decided to go with an iPhone 6S, however, (and yes, I know the Plus would be closer in size to the Pure), and part of the reason is frugality. I realize this decision may be counter-intuitive at first glance, but it is more frugal buy things that last. I plan to keep my next phone for at least four years. Would I keep a Moto X Pure for four years? I doubt it. I suspect I would keep it at most for two years and then get another. The 6S should be able to serve my needs for the next four years. Apple will keep the phone's operating system up to date, the hardware seems future-proof enough for four years (at least for my needs if it has 2GB RAM), and the build quality of the phone itself is good for more than four years. Frankly, were my 4S a 4+"-size instead of 3.5", I would likely keep it for another year. The Moto X Pure seems to be a fine phone, but I would have to give up the simple integration that i enjoy among all my devices. The perceived monetary saving is not worth that, at least to me.