Ever since the release of iPhone 5S in 2013, Touch ID has changed the way we use our phones — from unlocking the device, to storing passwords, to using our fingerprints to pay for goods via Apple Pay.
Touch ID is a known, proven entity. Face ID, which will replace Touch ID on the iPhone X, is less known.
Apple makes some bold statements about Face ID. The company claims it's less prone to being tricked than Touch ID. They claim it can also work in the dark, or recognize changes to your face — like 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 actually work in the wild when millions of people are using it. Simply put, 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 the guinea-pig era for Face ID.