Recs.
Updated
The iPhone X is the newest flagship from Apple. It's quite a departure from previous versions since it has removed the signature physical home key and introduced a new OLED screen (previous iPhones had an LCD display). It's also the most expensive iPhone to date.
SpecsUpdate
Pros
Pro No lag or stuttering !
Since both the hardware and software are designed in-house, Apple can make their software much more efficient than other phone manufacturers that have no say in OS design. As such, the iPhone X (and older versions) works flawlessly and has virtually no lag or stuttering to speak of.
Pro Performance is considerably better than on previous iPhone versions
The new 6-core, 64bit, A11 Bionic chip inside the iPhone X (and iPhone 8) does not disappoint. Performance is smooth, as is expected from an iPhone, and, according to GeekBench, the iPhone X has 25% better performance on single core and 80% better performance on multi core compared to the iPhone 7.
Pro The most colorful screen on the market
The iPhone X is the first iPhone with an OLED screen. OLED is the best smartphone screen technology on the market at the moment and the jump to OLED screens was long overdue for the iPhone. The 5.8 inch screen has rich, vibrant colours and inky blacks due to the 2436 x 1125 resolution. It's quite bright as well so you won't have any issues using the phone under direct sunlight.
Cons
Con The screen now moves around with gestures
Becasue of the removal of the home button, you now pull up from the bottom of the screen to go to "home"; however it's easy to make this happen when using a curveball or a charge move in PvP or "Go Rocket" battles, which can pull you completely out of the game and cause your 'mons to be slaughtered!
Con With the removal of the home button, opening the home screen became rather awkward
In the past, to open the home screen that listed your apps, you just needed to press the physical home button. Since the iPhone X does not have a physical home button, you have to swipe the screen from the bottom up to go there. This can be a bit awkward since you can accidentally switch screens when scrolling through a web page for example.
Con No fingerprint scanner
The removal of the home button unfortunately also brought the removal of TouchID. Apple has planned to replace the fingerprint reader with the new FaceID but it's not really an equivalent replacement since both of these security measures are completely different even if they both serve the same purpose. It would be similar to removing password locking when TouchID was first introduced.