Most likely:
V4=Base Mokujin in physical ability.
Thus V4=Full Kurama in physical ability.
Full Kurama>Half Kurama.
BM Naruto=Half Kurama.
Sasuke's PS=Half Kurama.
PS=SM Mokujin>>>Base Mokujin=V4=Kurama>>>Half Kurama=Sasuke's PS.
Madara's Susanoo is physically superior, by far, thus will put far more power behind it's strikes than Sasuke's Susanoo. So it's probably stronger in all other areas, such as durability, strength, speed, etc. But this only holds true if the bold is true. If it does, then Madara still slaughters Sasuke. And if it doesn't, Madara outlasts for the simple fact that Sasuke's offensive power is only small Mountain level at best, not nearly enough to damage Madara's Susanoo regardless of it being V4.