Right now they're very similar, but we're working on getting Awesometalk onto more platforms than just the web. We want you to be able to send anyone an Awesometalk link, and no matter what device they're using, have a conversation.
Apple actually is refusing to add WebRTC to Safari, because if you have good HTML5 support and WebRTC, you can do much more outside of a native app, which hurts their ability to control the app ecosystem, and helps developers ship to Android and iOS on the same day. I hope this changes, but right now it doesn't seem promising.