The difference between the price of the iPhone X and the iPhone 8 Plus is only $ 200, which is not considered great, but most Western countries sell phones in installments, and here the difference between the 8 Plus and X is only $ 10 per month, meaning nothing is mentioned. What is the technical difference between the two phones and is it worth the upgrade?

Design and Dimensions
The iPhone X is in a size closer to the traditional iPhone 4.7 inches than to the Plus, which makes it significantly smaller than the Plus phones. As for weight, the iPhone X weighs 174 grams, which is roughly the same weight as the iPhone 6 Plus and less than the weights of the 6s Plus and 7 Plus. As for the iPhone 8 Plus, it is the heaviest phone offered by Apple and its weight is equivalent to two-thirds of the weight of the iPad mini and equal to the weight of the iPhone 5s + the weight of the iPod Touch 6. As for the thickness, it is almost equal and the difference is only 0.2 mm, which makes us expect that the battery in the two devices is equal .
the screen

Away from the design, the iPhone X screen comes with a higher pixel density of 458ppi compared to 401ppi in Plus, and for the screen it is 1125 * 2436 compared to 1080 * 1920 in Plus. The difference is not only in the dimensions of the screen because it comes OLED versus LCD IPS traditional in the iPhone 8 Plus. The new screen offers a color contrast of 1:1000000 in the iPhone X versus 1:1300 in the iPhone Plus, as well as comes with HDR technology and Dolby Cinema standards.
the performance

Here the iPhone 8 Plus outperforms, and the reason is what was mentioned in the previous point, “the screen.” Because of the pixel density, screen size and technologies, the result is performance in X less than 8 Plus, where the latter outperforms in point tests by about 6% and is expected to increase the difference with the X applications that will be presented Additional functions that exploit the screen and cause performance reduction. Personally, I expect the performance difference to reach 10% later, but it will not be easily noticed.
Camera

A new difference between the two phones, where Apple used the second “Tele” lens ƒ/2.4 versus ƒ/2.8 in Plus, and this makes it provide more light images. The X camera also features dual optical stabilization (OIS) versus mono VPlus. It also comes with a quad flash versus dual V Plus. As for the front camera, it clearly excels in the X, as it includes the effect of depth and consequent features such as portrait, lighting and Animoji feature.
Conclusion
We cannot say that there is a huge difference between the two devices, but there is a difference in almost everything. The screen is better, the back and front photography, the design and the dimensions, in general, who will pay the additional $ 200 will feel a worthy difference.
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