Madara isn't going to use Susanoo as it is a weaker defense than the Gudo dama defense based on Omnyoton. The Gudo dama is the strongest defense and it should be because it is the unique ability granted by the Jubi.
PS vs PS would be badass as f***. Unfortunately since its such a massive scale I think the fight wouldn't be very fast (e.g takes time to move susanoo hand).