Is Kurama more powerful than Susanoo? In the fight between Naruto and Sasuke, we saw their battle. It seems that Kurama was more powerful than Sasuke's Susanoo (with bijuus).
Is Kurama more powerful than Susanoo? Yes, it is. From the wiki, 


  Even with half its strength, it could overpower Obito's controlled tailed beasts, smash Madara's senjutsu-enhanced Susanoo with a tail, and with the Six Paths Chakra, battle Sasuke's Tailed Beast-enhanced Complete Body — Susanoo.


That is just with roughly half its strength. At full strength, I would say it can easily overpower the aforementioned enemies, including Sasuke's Susanoo.