Sasuke has surpassed madara by normal uchiha standards as he has already accomplished PS and other feats that distinguished madara from the normal uchiha pack.
However, 3 eye madara is the combination of current sasuke and naruto rikudou powers. So, it makes no sense to assume sasuke is equal to 3 eye madara.....no sense at all.
This is wrong. They have many techniques and abilities which Madara hasn't.
We cant really know who is stronger now, maybe Sasuke destroys the world with a handclap in the next manga, who knows.
We can only try to interpret the hints Kishi gives us.
He let Sasuke do a CT which is smaller in radius, but without the weakness of a core.
So that should probably show that Sasuke has less power than Madara, but is technically more skilled.