Ok, out of these who do you consider is less impressive. Being prolific or currently active does not make them better or worse, just focus on the stories.
80s Miller: Daredevil, Dark Knight Returns, Year One, Ronin (maybe Sin City and 300, exclude if you don't like).
Moore: Watchmen, Swamp Thing, V, From Hell, Supreme, Tom Strong, Top 10, Promethea, Killing Joke, etc.
Gaiman: Sandman, Black Orchid, Books of Magic, Violent Cases, Green Flame, Miracle Man, Eternals, etc.
Morrison: Zenith, Animal Man, Doom Patrol, Aztek, JLA, We3, Filth, Invisibles, 7 Soldiers, Batman, Final Crisis, etc.