Below I'll try to address your questions:
- Kendo UI Professional contains 70+ widgets, while Telerik UI for JSP has server wrappers for 40+ of these widgets, but it basically includes all 70+ widgets without server wrappers for the mobile ones.
- The JSP server wrappers for Kendo UI allow you to instantiate our widgets using server-side code, if you feel more comfortable with server-side programming. Further information about our Telerik UI for JSP product you can find in this public FAQ.
I hope this helps.
Join us on our journey to create the world's most complete HTML 5 UI Framework - download Kendo UI