The definition of these periods is fine but I am not able to rank them. I love them all in their own way.
It would be like ranking your children. Doesn’t work.
John Williams has done consistently high-quality work, and I would probably find favorite scores in any periods.
The way Thor divided the periods, I suppose that the “golden period” from 1975-1986 may be my favorite. It contains 1975-1986 the most of my all time favorite scores, like CLOSE ENCOUNTERS, STAR WARS TRILOGY, JAWS, SUPERMAN, RAIDERS OF THE LOST ARK, THE TEMPLE OF DOOM…
But yeah, all the other periods are great too. Williams is one of the greats for sure.