The iPhone uses an OLED display whilst the Samsung's and others have moved to AMOLED. Yes, the AMOLEDs cost a little more.
I don't have an iPhone here that I can do tests on but generally speaking, AMOLED displays consume less power than OLED displays.
Mr. Scram explained it well. iPhone X’s display is AMOLED, too — it’s even made by Samsung. So yeah, I find it
extremely hard to believe that the iPhone X’s display uses more power. If anything, it’s likely to use
less, since it’s lower resolution and not quite as bright.
P.S. The “AM” in AMOLED stands for “active matrix”. That means that, just like in an active matrix LCD (TFT), there’s a transistor etched into each subpixel. (TFT stands for “thin film transistor”.) The transistor helps to store the pixel’s state and ensures that neighboring pixels don’t interfere with each other, as happens in passive matrix screens. But these transistors actually use some power, so all else held equal, an active matrix display will use
more power than a passive matrix display. But the difference in image quality is so huge that we now use active matrix for essentially all color displays, as well as high quality monochrome ones. But one effect is that the lower the resolution, the fewer transistors, and the lower the energy use. Additionally, lower resolution (for a given screen area) means less wasted space in the gaps between subpixels, so the ratio of lit area to unlit areas is better, also saving power.
Also, the higher resolution comes in handy when you're plugging your Android phone into a display or television which is becoming increasingly common as you're basically carrying around a fairly powerful computer in your pocket. I've done it on a few occasions. Of course you can adjust the resolution up and down in the settings to suit your needs (and increase your battery's run time). As an example, on my S8, I can adjust the display resolution anywhere from 1480x720 to 2960x1440.
Ah, well external displays are a completely different issue. I’m talking about the physical resolution of the internal display, and I maintain that a higher resolution (as in, the ppi) is useless above a certain point, which in screens at phone distance is around 300ppi.
The logical display resolution needn’t have anything to do with the physical resolution.
I haven’t used external screens on Android, so I dunno what it’s like. But I do use it on iOS (AirPlay to my TV), and how it works depends on the app. It can mirror the screen, or an app can send a separate video stream to the TV, such as video or a presentation.
Also, with regards to storage (as I mentioned to you in a PM), most Android phones include a microSD card slot which allows you to increase you memory capacity. You can also install applications to it so it becomes an extension of your internal memory. The newer models are capable ot using microSD cards up to 400GB in size, something that cannot be done on an Apple device.
I thought I read years ago that Android was going to prohibit apps on microSD storage. Whatever happened with that?