NSXMLParser vs TouchXML/KissXML frameworks?

What is the advantage of using these different frameworks (TouchXML, KissXML, etc) as compare to NSXMLParser?

Update: I think there are some other questions which had indirectly asked the same question, so i believe it w开发者_如何学JAVAill be repeat. So i am posting the urls of those questions here. Though i asked the question with some other things in mind but it's ok.

XML Parsing in Cocoa Touch/iPhone

iPhone Development - XMLParser vs. libxml2 vs. TouchXML

See this blog post with comparison of different XML parsers available for iPhone platform