Fingerprint:
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Pros: Very fast, works in complete darkness, hard for someone to observe or copy (on modern sensors)
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Cons: Fails with wet, dirty, or sweaty fingers; some screen-based sensors are slower than physical ones
Face Unlock / Facial Recognition:
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Pros: Convenient (just look at phone), hands-free, works with gloves
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Cons: Less secure on Android (often fooled by photos unless using dedicated infrared sensors like Apple's Face ID); can fail with masks, sunglasses, or poor lighting
PIN / Password:
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Pros: Universal, works every time, no hardware dependency
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Cons: Slower to enter, can be observed by shoulder-surfers, easy to forget if complex
Verdict: Use biometrics for daily convenience (fingerprint or secure face unlock) + a strong alphanumeric PIN as backup.