Pairing to your iPhone is made easier with the W1 Chip. All you need to do is open the case of the AirPods while it is near to your iPhone. A window will pop up and prompt you to pair the AirPods to your iPhone. This is much easier and faster than searching through the menu to pair the devices.
Unlike other headphones, because the Airpods have the WI chip, it is able to detect if the headphone is actually in your ear or not. Your music will only start playing once it detects that the Airpods are in your ear. If you have in one of the Airpods, it detects it. It also manages a connection that is unique for each of the Airpods which no other wireless earbuds to date can do.