There are three Italian directors who share the title Master of Horror from Italy. Mario Bava, Dario Argento and Lucio Fulci. Their styles are so diverse that you really cant compare the three to each other. Argento is the only one still active, as the other two are deceased.
Dario is known as a 'horror stylist' due to his artistic view behind the lens. He has filmed some radically complex tracking shots, which show the camara travel out windows, around roof tops and into other dwellings without cutting the shot. He has some truelly great artistic visions and realizes them greatly on film. Few can match his eye for the camara. And his use of color in films like Suspiria is just plain fascinating.
I have had the pleasure of meeting him twice and he is a very sincere man. I told him I named my two cats after him and his daughter Asia(say Azia) and he laughed.
People make movies for various reasons like money, fame, clout, etc.. Dario said he makes movies because he wants to be loved. Im sure it pleases him that his legions of fans do love his work.
A main body of his work consists of gory thrillers(Giallo in Italian) but I always favored the films with supernatural themes like Suspiria. He is showing no signs of slowing down with his latest release of Mother of Tears, the third and final installment of the suspiria series. This was by far, his goriest film to date and marked a hardkore comeback. His new thriller titled Giallo should be out soon.
Although he never directed a zombie type film, he served as producer on Romero's Dawn of the Dead. He assured Romero half the budget of the film($750,000) in turn for international rights to distribution. He re-cut the film himself, using a more prominent soundtrack from the progressive band, Goblin. The film also features many alternate scenes that are totally different. He also served as producer on Lamberto Bava's(son of legendary director Mario Bava) films, Demons and Demons 2. They are demon films in the vein of Evil Dead but many zombie afficionados hold them dear. I would love to see him direct his own zombie film but that will never happen. I asked him during a Q & A session at a konvention and he laughed, saying "that is George Romero's thing, not mine."