sunking has a point about iMessage but he doesn't know how to make it.
iMessage is definitely the most convenient messaging app in phones today. Coupled with FaceTime, on no platform is it easier to connect with family and friends.
However, people with Android phones communicate just fine. You can video chat with Hangouts, too -- just as easily as you can with an iPhone. You can send a message via Hangouts the same way you can with an iPhone. You don't need to have a particular Android phone, either -- there are a lot more models that support Hangouts than iPhone models that support iMessage. People just don't really know about it, because google isn't pushing billions of dollars in ads to tell people you can video chat on an android phone.
iMessage is not unique or particularly more feature filled than Hangouts, nor is it more essential to the user experience. What Apple has is awareness of features, and a better integration into its OS. Hangouts will get there, but people have to be aware of its existence.
The beauty of an Android phone is its breadth of options, customization, and flexibility. This is also its biggest weakness, while Apple's biggest strength is stability and feature retention. Apple is slowly moving towards an Android-esque OS, with custom keyboards, widgets, new APIs, and of course a bigger screen phone and likely phablet.
Where Apple lagged, Android picked up but never found a singular approach. Android continues to improve at a faster rate than Apple is improving, but with the large lead Apple had, will it be enough?
Android L might be everything an Android user ever wanted when it comes to stability, feature consistency, and an overall cleaner, more stable experience. Apple's march towards openness and a willingness to listen to its customers can only help.
It's going to be an interesting few years. Android is becoming more like iOS and vice-versa -- things like Hangouts and iMessage aside, the most important choice in your mobile OS in the coming years may not be UI or feature consistency, but rather synergy with our lives. When it comes down to it, whether you own an Android phone or an iPhone, the most important thing is that it integrates with you, the hardware disappears and the device becomes part of you. Wearables will only accelerate that. At that point, whether or not someone has iMessage or Hangouts won't matter -- the only thing that will matter is that we'll all be unmistakably connected.