How many phones on the market run iOS, and how many run Android? It does matter because, believe it or not, iOS apps are still better quality. Android has come on but it's still not equalised there. Maybe that's subjective but there's some validation in developer uptake, and in the way apps optimise on devices.
But if we're just talking about hardware, there still is quite a difference between a OnePlus One and an iPhone 6 Plus - or a Galaxy Note 4, for that matter.
- Build quality is going to be far higher on the 6+/Note. The 6+ is nearly 2mm thinner, the materials are going to be more premium (I know the OnePlus One has pretty great build quality for the price, but it's still not equal to the iPhone's - sorry, it just isn't. It's matte plastic vs machined aluminum). The longevity of the One is unknown as who knows what components they used on the inside? I saw a report of one melting in a back pocket the other day. What about the antennae? The radios? The audio jack? The speakers? The glass on the screen? The actuation of the buttons? Are you telling me they matched Apple's attention to detail? I doubt it.
- The optics are far superior on the Note4 and the 6. The One has a fairly middling 13mp Sony sensor while the 6/6+/Note4 are using the highest possible quality camera lens that technology can create at their size. That's a big factor for our family when we use the phone as our primary camera.
- The screen quality will be much better. Forget about the fact that it's the same resolution screen - the 6+ laminates the pixels as close to the glass as you can get it and the impression (according to Anand) is remarkable. The Note4 uses a 2k Super Amoled screen which is also ahead of anyone else. The One's screen is a pretty standard, good quality IPS display - it's nice but it's not going to melt anyone's eyeballs off.
- The chipset is newer and faster on both the Note4/6+.
Early benchmarks of the A8 put it ahead of the 805, which is obviously ahead of the 801. Whether you can feel it subectively or whether you even care is another matter, but new tech costs more.
- TouchID is quite a costly little component to make. Then there's the M8 coprocessor.