PHD,
I agree with Herman and Navid. I also have LSU Purple. Last season, my first having it, it produced heavily but than LSU Scott's Black. Also, in terms of production, Purple was much better and sweeter than Scott's Black. However, the flavor of Scott's Black was more complex. Given a choice, if at their best...Yes. I mean...Yes, both! Note. Both are in 10 gallon pots.
I would also add LSU Improved Celeste to the list. I am interested in reading more information about LSU Golden Celeste, LSU Late Black, O'Rourke, and LSU Scott's Yellow as well as posting some of my own.