“Though Comet and Ajax can both deliver end-user experiences that provide desktop-like functionality and low user-perceived latency, only Web Sockets lives up to the promise of providing a native means to accurately and efficiently stream events to and from the browser with negligible latency. It is by far the most comprehensive solution for delivering real-time information over the Web. Not only does it provide full asynchronous duplex streaming communication with a single TCP/IP connection, but also benefits from few HTTP headers and more importantly allows the same message format to be used by both the browser and the origin service.”
Read the full article here: http://www.infoq.com/news/2008/12/websockets-vs-comet-ajax
Dio Synodinos 