For the money, I would get the O/93s. I think they are more cohesive and balanced. I noticed little to no difference in efficiency.
This is exactly what Don Better told me the one and only time I came to visit him up in Cleveland to audition the O/93's. He did not have the O/96's available to compare and he knew that I was primarily interested in the 93's. I paid for them that day and received them directly from Brooklyn a week later. It appears he lost his Devore dealership rights.
At Axpona one year I went back and forth between a room with the O/96's and a room with the O/93's, no less than four times each. I liked the 96's a lot more than the 93's even though they sounded less cohesive-they were far more engaging. They were set up quite differently-the 96's along the long wall with nearfield seating and the 93's along the short wall with seating further back.