nexus might be quicker but at least you can put the iphone flat and unlock it. having the nexus fingerprint on the back is stupid to me. so really techinally it's quicker on the iphone as you don't need to put your finger to the back of the phoneExcept that TouchID doesn't work as well as the Nexus Imprint on the Nexus 6P/5X. I had a Nexus 6P before my iPhone 6S Plus and one thing I did notice was that TouchID on the iPhone isn't near as accurate as the Nexus one. Even with wet fingers I could unlock my Nexus device whereas with my iPhone even slightly damp fingers blocks the phone from being unlocked.