Apple earned kudos for embedding a fingerprint sensor into the iPhone 5s' home button, but Samsung has taken biometric security to the next level on the Galaxy S5. In addition to using the Galaxy S5's fingerprint reader (which is also built into the home button) to unlock the phone, you can enter a "private mode" that provides added security for your most sensitive documents and emails. The sensor also integrates with PayPal for secure online purchases.
Samsung also bundles the Galaxy S5 with its unique KNOX environment, which places business data and apps into a separate environment. Your corporate IT manager can feel secure knowing that your apps, business contacts and emails all live in a secure area of your phone, while you can feel comfortable knowing the IT department is not looking at your personal data.