Face ID requires two steps: looking at the phone and swiping up. This process can be less reliable in certain conditions, such as when the phone is on a table or laying on the bed.
Ultrasonic Touch ID offers a more seamless experience, simply requiring a thumb placement. As an in-display sensor, it eliminates the need for a large notch, providing a cleaner and more immersive screen."
Based on the ease of use and versatility, Ultrasonic Touch ID appears to be the winner for me.
I really hope for TouchID only iPhones under the display. I don't want to put tape directly on the display for not scanning my face all the time. 🙈