The launch of the iPad has spurred an old debate – Which is better, Ajax or Flex. The fact that iPad does not support Flash has not only stirred the dormant argument, but also brought up questions about the future of RIA technology.
Both the technologies are essentially different with a distinct set of strengths and weaknesses. Experts suggest that Apple’s decision has nothing to do with the merit of any technology in particular.
About AJAX: AJAX is a methodology for producing RIAs. It is normally used on top of web pages to add functionalities like pop ups and shadow boxes, and smart features like drag-and-drop. AJAX is definitely more popular due to its search engine friendly attribute and no Plug-in requirement.