Most phones have the finger print scanners now. My work Samsung Galaxy S6 and my home Moto Z Play both have it, although I don't bother (or cant due to work policy) to use the feature. With finger print scanners, sometimes they're quite finicky when it comes to reading the fingerprint.
The biggest issue though is it isn't that hard to lift a fingerprint from somewhere else on the phone, make a copy of it, and use it to get into the phone if a thief wanted to when your phone is stolen. It's actually easier to hack than the pattern method. For work, they make us use a normal passphrase password that requires an upper and lower case letter, a number, a special character, and is at least 8 characters in length because the other methods are not secure enough.