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Does any link juice get passed from a permanent redirect to a new 301 redirect? If so, are there any studies which indicate an estimated percentage?

What are some best practices or tips for handling duplicate content issues for sites built on ASP.NET Web Forms? One duplicate content issue I see all the time is www.xyz.com/pages/ and www.xyz.com/pages/Default.aspx. While I'm able to canonicalize the www and non-www version of the domain in the web config file I'm not sure what the best way is to remove or keep the default.aspx from being indexed. I know we can specify certain parameters for the search engines to ignore but isn't it better to have this done on the server side?