Susanoo is a better tank than Kurama. Hence why you see Madara blocking 9-tails own tailed beast bomb with the Complete Susanoo.
So Yang Kurama tanking is better than Full Kurama? Didn't Yang Kurama tank Juubi's laser like tbb?
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. Yang Kurama took on RasenShuriken and was just knocked down so it could be that Madara didn't want Kurama knocked down which would make it easier for Hashirama to take control over Kurama. Naruto was using Kurama's chakra to Tank Madara's and Obito's Katon attacks and The Juubi's storm attack. The juubi's attacks should be stronger than a non charged (just formed and fired) tbb. Juubi's storm-http://narutobase.net/manga/Naruto/629/2.Also remember 4 tails Naruto? Orochimaru sword that has the power to cut things couldn't pierce the 4 tails, Full Kurama has that dark chakra under his muscles and fur and we see the bones grow around 6 tails and the muscles around 7-8 tails and 9 tails would be the fur.