jQuery vs MicrosoftAjax in ASP.NET MVC

Question

Under what circumstances would you use MicrosoftAjax over jQuery in an ASP.NET MVC application?

According to Scott Cate in this podcast Object Oriented AJAX with Scott C

Answer 1

I have tried to use both more or less side by side.

The builtin ajax helpers works fine.

But jquery has a smaller footprint and is more transparent in use.

And when using the ajax helpers I get immediate results but no sense of what goes on behind the scenes

Besides If you have to bridge over into jquery in order to extend your ajax scenario, you might as well start there.