Silverlight more flexible?
Interesting point from Andrew, which I think in this case is just as well applied to Silverlight.
Silverlight, just like Flex, is not tied into the Microsoft stack and will run just as happily with LAMP, CF etc on the backend.
However unlike Flex, the Silverlight programming model is also neutral, supporting multiple programming options, C#, VB, Javascript, Python, Ruby etc to name but a few.
This gives the developer the broadest freedom, rich experience in the browser and total freedom of choice in terms of both backend support and development language for the application.
Of course just like Flex all this application/developer goodness depends on a plug-in for the browser, Silverlight.
Jon Harris, User Experience Evangelist, Microsoft UK