omega44-xt
Gear up ...
If you don't trust the people near you, put a PIN code.Both fingerprint and face unlock are reliable as the former us unique for every individual and the latter uses AI to detect. My concern here is, what is you're sleeping and someone slowly places your finger to unlock your phone? How would you trust that? You never know if someone does that to you.. I think that there should be an iris detection in the phone. The patterns of the iris in a human eye are also unique for everyone. That's what my opinion is.
Face unlock is the weakest in terms of security. Iris unlock is secure but is slow, so even Samsung is rumored to remove it from S10.