Both Touchid and FaceID work well for some and not for others.
The introduction of TouchId brought with it substantial functionality, FaceID atm only exists because the home button needed to be removed to make way for more screen space, it brings very little that’s new to the party.
Face ID is faster than Touch ID and works effortlessly, its as if your phone has no security on it at all.
It's something I thought I'd hate but turns out to be the greatest feature on the iPhone X. Security without interference. Imagine a door knob that never needs setting and only allows you in every time you try. Imagine a cup of juice appearing on your breakfast table just by thinking about it. That's what Face ID is like.