Daniel Dilger writing for Apple Insider:
A consumer sentiment report of early iPhone X adopters indicates that its TrueDepth camera is a “major driver among positive ratings,” and that the features it enables—including [Face ID] and Animoji—are key market differentiators driving interest in the high end phone
Face ID is the killer feature for me on the iPhone X. It makes so many interactions more natural when the authentication just happens rather than having to actively do something to make it happen. Touch ID is still great, but Face ID is definitely better.