Price wise the iPhone X ($999) (it’s worth noting that the UK’s
price is similar to this price in £’s) seems technically closer to the Note 8 ($950) than the Samsung Galaxy S8, because of the Note’s higher price tag, but don’t ignore the Galaxy S8 ($750) and S8+($850) due to their lower price tags.
The Galaxy S8’s and the iPhone X both use Oled which gives a better overall contrast ratio compared to LED screens. They both measure the same size at 5.8 inches but with the Samsung Galaxy s8 you get a higher resolution screen(2960 x 1440 pixels) also with the plus version you get also a whopping 6.2-inch screen real estate which gives you an even bigger screen than the iPhone X (2436 x 1125) for a fraction of the costs. But overall the iPhone X produced a better overall image quality. But its worth pointing out that all the OLED screens are all made by Samsung.
But when it come to sheer speed the Bionic A11 chip is much 
faster than the Samsungs Snapdragon 835 chip. For example, Just look at the loading up times of a new level in Injustice 2, a fighting game. There was a 13-second wait on the Galaxy S8. In just 9 seconds iPhone X had us throwing punches as Batman.
Now if you compare the cameras, it was roughly a drew but the Samsung S8 often produced a less noisy image during Low Light photography. But it’s worth pointing out that there was more of a warmth to the iPhone X’s photos and a slightly higher Colour saturation too. But if you include the other things that apple give you with their camera such as a second 2x optical zoom lens and a bunch of studio mode effects that let you simulate similar effects taken by a DLSR camera in a professional studio then the winner goes to the iPhone camera.
Now if you look at the weight between these two devices the Samsung galaxy s8 is the winner at 5.5 ounces or 155 grams, the S8 is a little lighter than the 6.1-ounces or 173 grams of the iPhone X. In fact, the S8+ weighs the same as the iPhone X.
When it comes to Storage the iPhones offers the best storage solution, because it offers the most at 256gb. The Samsung Galaxy S8 offers only 64gb but it can be expanded upto 128gb with an SD card. But often sd cards are often not as reliable and the Android system does not give you the option of sideloading many apps on to the sd card memory. So the winner is the iPhone X.
Lastly because the Samsung S8 runs on the Android system it is held back in a number of ways. Firstly the apps are not as polished as on iOS also the software is not as optimised to run as well as they do iOS devices. Also software updates tend to take much longer to happen than on iOS, which can lead to vital security flaws not getting patched up quick enough. Another thing that worth pointing out is that if you try and run Android devices with accessories such as Android auto, they tend to not run aswell as they do on iOS devices.
Overall the winner is the iPhone X but for its price the Samsung Galaxy S8 is great value.
