Face ID and Touch ID both work better under different circumstances and both fail under different circumstances. If it’s cold and I’m wearing gloves, Apple Pay with Touch ID doesn’t work but Face ID does. If it’s really cold though and I’m wearing a scarf, it is easier to take my gloves off and use Touch ID. That said, my face is generally not obscured in day to day usage. Where Touch ID typically came up short was because of wet fingers or grime on the Touch ID sensor itself, and this occurred surprisingly often. Where Face ID comes up short is when the camera can’t get a clear reading due to the angle or distance of the phone from my face. Touch ID didn’t have this problem because the “target” was the home button, which you can see and feel. Positioning your finger was obvious. The target is less clear with Face ID because there is no real target other than looking at your phone. Perhaps what is needed, rather than a passcode prompt after a split second, is some sort of graphic that guides the user to move the phone into a good position for a scan. It needs to allow the user to correct their facial positioning. Touch ID allowed for this because you could quickly reposition your finger of the scan failed and it only prompted for a passcode after several attempts. I’ve noticed that Face ID often tries to scan my face as I’m lifting the phone with raise to wake. Because it scans so quickly, it often fails because I haven’t fully raised the phone to a good angle. I suspect these kinks will be worked out and generally feel Face ID will be superior in the long run though.