Glad to see Priestroke mentioned already, that is the run that made me give a damn about Slade. Ostrander’s Spectre was also a banger, it was basically a Vertigo book similar to Hellblazer moreso than a superhero book. Love that run, wish we would get an omnibus.
I’m going to cheat and list two because I can:
Writer: Grant Morrison
Years: 2011-2013 approximately
This is my favorite Superman run of all time, a run that “gave Superman his balls back” to swipe a quote about Frank Miller and Batman. No more walking across America or moping, this was a Superman who tackled everything from street crime to cosmic invaders to dimensional demons.
Writer: Joshua Williamson
Years: 2016-2020
This was the run that finally made me care about Barry as a character. Williamson had a few dips here and there quality wise such as the Forces, but overall this is a solid great run, the best Barry Flash run imo, and well worth checking out for anyone looking for Barry Flash stories.