The iPhone 8 and the iPhone X are powered by the same brain, each of them is powered by the same A-11 Bionic chip, a neural engine, and the M-11 motion coprocessor. The only difference is how the phones use these features: The iPhone X uses the A-11 chip and neural engine for its new face-detection system, Face ID, which the iPhone 8 does not have.
Touch ID & Face ID
Touch ID is something proven where as Face ID is not. Touch ID has changed the way we use our iPhones,unlocking the device, storing passwords, and using our fingerprints to pay for goods via Apple Pay. Touch ID is a known, proven entity. It’s unclear how well Face ID, which will replace Touch ID on the iPhone X, will work.
Apple makes some bold statements about Face ID, such as that it’s less prone than Touch ID to being tricked, can also work in the dark, and will recognize changes to your face — if you grow a beard, or wear glasses, or change your hair, or put on a kooky outfit. But we still don’t know how Face ID will work in the wild when millions of people are using it. Technology is not infallible, and it’s impossible to predict what could go wrong with this unlocking method. (Thankfully, the passcode backup still exists.) By choosing an iPhone 8, however, you choose to forgo being a guinea pig for Face ID.
Fast charging & Wireless charging
The iPhone 8 and the 8 Plus and the iPhone X.All of these phones support the Qi wireless-charging standard as well as fast charging.The downside is that you’ll have to buy extra accessories if you choose either new charging method.
Apple offers several Qi wireless-charging pads (its AirPower pad won’t be out until 2018), and you’ll need to buy the equipment — a Lightning-to-USB-C cable and a USB-C Power Delivery-compatible charger, specifically — if you want to use fast charging for your iPhone 8, 8 Plus, or X.
Again, this is one more expense to consider when thinking about the iPhone 8 versus the iPhone X, which starts at $1,000.
Since everyone is so focused on the iPhone X, the iPhone 8 is easy to find and buy — even today!
Meanwhile, the iPhone X will most likely be in high demand and short supply, meaning lots of people will probably be waiting weeks for their phones to arrive while you’re sitting pretty with your iPhone 8, which has arguably all the biggest advantages of the iPhone X with a more reasonable price tag.