Best Actress Battles: Marion vs. Rosamund?

With the internet strenuously erecting a ring in which Julianne and Jennifer can mud wrestle, and wondering who could be a surprise snub, let's look at one more imaginary Best Actress Battle with this Oscar category that appears to have six women in it. One too many. Let's call this one the Critical Darling Cha-Cha.
Gone Girl vs. Fired Girl
Two weeks ago when their was a seeming abundance of "fifth slot" possibilities for Oscar's Best Actress race, Marion Cotillard emerged from a non-campaigning overseas cloud to claim Critical Darling status. In quick succession she took prizes from three early-announcing critics group: the venerable New York Film Critics Circle as well as Boston Society of Film Critics and the young New York Film Critics Online group. Some of those prizes were shared with The Immigrant but since The Weinstein Co wasn't backing their early release with a campaign of any kind, it soon it became clear that Marion's worker solidarity drama, the Belgian Oscar submission Two Days One Night was the one. She's such an amazing actor that which film it was hardly mattered...