If you fear for your security, FaceID AND TouchID are poor choices. Go with a very long, secure password. Quit crying.
But this just isn't practical. Putting in a long password everytime I unlock my phone would be infuriating. Most people have a 4 digit passcode which is very easy to see someone input.
Touch ID is undoubtedly the most secure in real world use with Face ID most likely almost as secure.