My phone has different options for security: fingerprint, face recognition, and even an iris scanner. What option is better?
It is a matter of preference. For me, the fingerprint method is more convenient. It works faster.
I suppose the topic starter asked about more technical things than just convenience. In terms of reliability, many experts argue that fingerprint is better. Computer vision models can make mistakes when recognizing faces. It is especially important when you have relatives which look like you. Also, it is sometimes possible to unlock the phone by showing the photo of the owner to the camera.
Ok, but besides the security, there are also other factors. For example, the speed of unlocking. It takes more time to recognize face than to recognize the fingerprint. Also, in some conditions, it is harder to unlock the phone with the face (hat, different angles, lack of light, etc.).