Today the people behind Vaadin released an updated comparison matrix that lines up the most popular and prominent rich web technologies for a truthful comparison matrix. They're now trying to gather feedback for any mistakes they might've made in the data points, or other things that might've be unclear or simply wrong.
Some introductory information about the new matrix can be found in the release-blogpost at http://vaadin.com/blog/-/blogs/new-comparison-matrix, but the comparison matrix itself is found at http://vaadin.com/comparison