I am running TFS 2008 and plan to upgrade to TFS 2010. There is no Test Case work item in TFS 2008 (only in TFS 2010) and I am wondering what is best, to create a Test Case work item in TFS 2008 and later import in TFS 2010, or, create the test cases in Excel and use the CodePlex utility to import into TFS 2010?