I also tasted both of them but not side by side.
In our climate ,north east these cultivars are not well adapted so they are not easy to grow to the age when they will produce ripe figs every year.
They are for Gardeners that really want to push the envelope and take such a good care of them that they will pay back with ripe fruits.
In any case they are not Sal Gene or Marseilles vs black when it comes to easy to grow.
Having that in mind Barnisotte Black will ripe easier ,here than Madeira Black.
The fruits are better tasting on Barnisotte black because they are more close to properly ripe and not because ,Black Madeira is inferior.
Black Madeira needs longer hotter Summer to be properly ripe.
On the other hand if a tree gets older ,the older it gets the earlier it ripe the fruits.
So ,if one is patient,I think that at about 7 years of age,Madeira Black will start getting properly ripe fruits every year here in the North east.
My tree is 5 years old and it had ripe fruits but not properly ripe fruits.
This year it started forming Embryos early so I have hopes they will ripe properly.