Different susanoo's cannot be compared, Madara's susanoo has its own feats and they are only applicaple to Madara. that should be obvious. Sure, both Minato and naruto can use rasengan, but for the longest Minato's was still stronger.
-How can you compare susanoo's? They are completly different, sasuke has a amaterasu sword for crists sake, his susanoo is different than madara's. Just becuase Madara cut multiple mountains with PS sword swing shockwave- doesnot mean sasuke can- They are using different swords, should be ovious.
Since the feats that Sasuke's perfect susanoo got are unquantifiable, you cant just scale sasuke's PS to Madara's.
First, Sasuke wrapped his PS around a kyubi that is half the size that Madara wrapped around, considering that- you cannot assume sasuke can make a larger susanoo without evidence, at best you can powerscale and say that sasuke's PS is half as strong as Madara's.