Smartphone security: What's better to use a PIN, facial recognition, or your fingerprint?

Locking your phone keeps out snoops, but it's also your first line of defense against hackers and cybercriminals out for your data and anything else they can steal. Tap or click for 3 safer ways to pay for things online other than credit cards. So, what's the best way to secure your phone? Is it biometrics like your fingerprint or a scan of your face? Most people aren't very good at creating hard-to-crack passwords, so yours might not even be effective at keeping your devices or your accounts safe.