Using Javascript UI controls Vs Server-side Controls

While looking for a 3rd pa开发者_运维知识库rty web UI controls library, I need to know whether I should go for a script based solution like ExtJS,DHTMLX, YUI, etc or a server side one like telerik or DevExpress? Tell me with these areas in view:

1- control 2- performance 3- programmatic manipulation 4- ease of development 5- learning curve

in performance i think java-script Based are faster and more user-friendly because of the ability to dynamically change during the run time while server base GUI's are static like a stone i don't know in other views

It really depends on what you need.

For MVC3 Web apps I would recommend client side libraries. jQuery UI is small and fast, very popular so community is strong. Downside is it has relatively small number of widgets.

If you need greater number of widgets then use something as ExtJS or YUI but that comes with a price of size and performance.

I think best approach is to check out websites of jQuery UI and YUI and see which widgets do you really need. If jQuery UI satisfies you, then go for jQuery UI.