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Turning the background black with white text is usually called Night Mode and it's not the same thing as high contrast mode. It is somewhat beneficial when reading on an LCD screen since it makes more of the screen dark and shines less light into your eyes as you read.
High contrast mode is available on most devices. It's usually a feature of the device and not the app, although there may be apps that provide it as well. It leaves the background white or sepia, depending on how it's set, and increases the darkness of the font. It also mutes the background a bit to help with the glare from the backlight.
If you google high contrast mode you'll mostly find what Windows calls high contrast mode, which does make the screen black. That's a Windows thing. In Android, and presumably IOS, although I don't really know about IOS, it modifies the colors a bit and increases the contrast without reversing the text and background.
Also someone mentioned that LCD is reflective and that is part of the reason it doesn't work well in sunlight but it's only a minor part of the reason. It's more about the way LCD works. An LCD panel gives no light off at all. It simply changes colors. To make that visible there's a backlight behind the LCD panel and the light shining through is changed by the color of the LCD panel creating the image (or text) we see. If the light on the near side of the panel is already so bright, as it is in sunlight or even shade on a sunlit day, the light behind the panel can't compete and has little effect. Look at a pair of headlights at night and then in the daytime and you'll see the difference.
One of the problems in deciding which is better is that it's really a very individual thing. Some people's eyes aren't bothered by staring into an LCD. Others are. Mine are so I have to do it carefully.
Some people like to read outdoors and they're certainly better off with e-ink but a lot of people, such as me these days, read mostly indoors. I've done a lot of reading outside all my life but as I've gotten older indoor reading has become my main thing. I still read outside at times and I always use my Kindle for that. Inside, too, actually. But the phone is always in my shirt pocket and it's really handy and my phone has a bright enough display that I can read in most situations although it's certainly not optimal in bright daylight.
It's like most techy things, there is no "best". It's what works best for you that matters.
Barry
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