Chiming in here on the 6S Plus vs the regular 6S discussion...
I've owned the 6 Plus for nearly twelve months. Two weeks ago I sold it, so I could upgrade to the 6S or 6S Plus. For now, I'm using an iPhone 4S.
I am still undecided whether to go for the 4.7" iPhone 6S or the 5.5" iPhone 6S Plus.
There are, in my opinion, two great reasons to get the Plus:
- Battery life
- Larger display with higher pixel density
That said, you shouldn't factor in the following two when making your choice between the 4.7" and 5.5" iPhones:
- Landscape mode
- Optical Image Stabilization
The negative:
- The 5.5" model is a large device!
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To explain myself in more detail:
Battery life is absolutely amazing. I'm on an iPhone 4S now and battery life is absolutely terrible. Yes, it's a few years old but the 4.7" iPhone's battery isn't that much better. The 6 Plus is the first iPhone that, in my opinion, truly has all-day battery life. I've been using iPhones since the 3GS in 2009 and not a single iPhone has ever come close to what the 6 Plus achieved.
Secondly, the display is terrific. Don't get me wrong: there is nothing wrong with the 326 ppi display used on the 4.7" iPhone - it's still sharp. But now that I've been using the iPhone 4S, with a 326 ppi, for two weeks... well, I really notice the difference. I'm incredibly used to the higher pixel density of the 6 Plus display... the 326 ppi 4S display just looks a bit pixelated too be honest.
Now for the stuff that you shouldn't factor in when deciding between the 6S and 6S Plus. Landscape mode is absolutely useless. Most apps open in portrait by default, even when you're holding your phone in landscape mode. Additionally, nearly all apps that do support landscape mode are not optimized for the 6 Plus display, unlike Mail and Messages which are one of the few apps that are optimized. In most third-party apps, you'll get the exact same landscape experience on the older iPhones.
Optical Image Stabilization is nice to have, but is not important. Ask yourself: how often and how many pictures do you take in low-light situations without the flash? In my experience, most people take pictures with the flashlight turned on in a low-light situation. But, above all, most pictures are taken when there is enough light - and in that case, OIS doesn't do anything.
Now let's talk about the huge negative thing here. It's a large device. It's really large. Competitors create phones with 6 inch displays with the dimensions of the iPhone 6(S) Plus. I bet next year's iPhone will have reduced bezels and that's the moment when the Plus model becomes more portable. But right now... it's large. It's not a device you take with you to the gym. And it might cause some uncomfort when it's in your pocket while you are cycling, or even when sitting down.
Also, if you are person that uses a cases on their phone, remember it's going to be even bigger. Its physical size is the big disadvantage of the 6 Plus and 6S Plus.