When is it best to use Lexis Advance and when is it best to use Google? Although Google is a powerful search tool, Lexis Advance is a more precise search tool. You will return more results with Google than with Lexis Advance or Nexis Uni. That means you have to read through the cases to decide which are useful. You also do not have the benefit of headnotes, which can make reading the main points of a case quicker.