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• WebRTC is good for streaming and peer to peer web application.
• WebSocket is good for centralized real time application like broadcast event or chat.
• WebRTC is has higher performance, while WebSocket is more for bi - directional communication.
• So, for video chat application. The streaming should be done within WebRTC while the text chat should go with WebSocket.
• Links to StackOverflow discussion are these.
  • http://stackoverflow.com/questions/18799364/webrtc-vs-websockets-if-webrtc-can-do-video-audio-and-data-why-do-i-need-web.
  • http://stackoverflow.com/questions/36104843/is-socket-io-the-webrtc-or-websocket-or-something-else.
• Screenshot of both discussions.