I liked both figs, The Negronne I have sets two crops, the breba tasted really good as well. Here are the main differences:
ripening time, The Negronne is in a pot, the Ronde de Bordeaux is in the ground, the RDB ripened now while the Negronne still needs at least 2-3 weeks.
The skin is thicker on the Negronne and not as soft and sweet as RDB.
The Negronne has more acid in its flavor, and if the weather is not hot enough it doesn't develop the best flavor.
Here's some photos I took as it was ripening from green to black in 3 days.
The tree is only about 4'-5' tall. It is a very vigorous tree.