Question: Does Bill Duke or Robert J. Flaherty have more credits for documentary films?

Context articles: Yair Qedar
Man of Aran
Helen van Dongen
Elephant Boy (film)
Louisiana Story
Nanook of the North
Moana (1926 film)
Bill Duke
Robert J. Flaherty
Frances H. Flaherty

Yair Qedar (Hebrew: יאיר קדר‎ ‎ , born June 13, 1969) is an Israeli filmmaker and a civil-rights activist.His academic training on 20th-century Hebrew literature (Tel Aviv University), propelled him into to The Hebrews — a trans media project on the Hebrew literary canon, centered on filmic portraits of the Hebrew writers.
 Eight documentary films were made in this framwork and six others are currently shot.
 The documentary films which he produced, wrote and directed are —"Bialik - King of the Jews", "The 5 Houses of Lea Goldberg" and "The Seven Tapes of Yona Wallach", 'the Awakener - the story of Y.H Brener' and 'Simple Woman -Zelda'— as well as the three films which he produced in the project - "Song of loves, Rabbi David Bouzaglo", "the Raven, Zeev Jabotinki" and "Mrs Rachel Bluestein" – aired on Israeli TV, circulated far and wide in cinematheques, community and cultural centers, in Israel and around the world (USA and Canada, Europe, Australia and Russia) earning 10 awards (2016: first prize for filmmaking in the field of Jewish culture by the ministry of Education in Israel, 2015: the "Hebrews" films won the prize for best television project in the Israeli Documentary competition).
 The project, both digital and print, offers altogether eight documentary films, a video archive and several books.
Man of Aran is a 1934 Irish fictional documentary (ethnofiction) film directed by Robert J. Flaherty about life on the Aran Islands off the western coast of Ireland.
 It portrays characters living in premodern conditions, documenting their daily routines such as fishing off high cliffs, farming potatoes where there is little soil, and hunting for huge basking sharks to get liver oil for lamps.
 Some situations are fabricated, such as one scene in which the shark fishermen are almost lost at sea in a sudden gale.
 Additionally, the family members shown are not actually related, having been chosen from among the islanders for their photogenic qualities.
Helen van Dongen (January 5, 1909 - September 28, 2006) was a pioneering editor of documentary films who was active from about 1925-1950.
 She collaborated with filmmaker Joris Ivens from 1925 to 1940, made several independent documentaries, and edited two of Robert Flaherty's films before retiring from filmmaking in her 40s.
Elephant Boy is a 1937 British adventure film starring Sabu in his film debut.
 Documentary filmmaker Robert J. Flaherty, who produced some of the Indian footage, and supervising director Zoltan Korda, who completed the film, won the Best Director Award at the Venice Film Festival.
 The film was made at the London Films studios at Denham, and in Mysore, India, and is based on the story "Toomai of the Elephants" from Rudyard Kipling's "The Jungle Book" (1894).
Louisiana Story (1948) is a 78-minute black-and-white American film.
 Although the events and characters depicted are fictional and the film was commissioned by the Standard Oil Company to promote its drilling ventures in the Louisiana bayoux, it is often misidentified as a documentary film, when in fact, it is a docufiction.
 The script was written by Frances H. Flaherty and Robert J. Flaherty, directed by Robert J. Flaherty.
Nanook of the North (also known as Nanook of the North: A Story Of Life and Love In the Actual Arctic) is a 1922 American silent documentary film by Robert J. Flaherty, with elements of docudrama, at a time when the concept of separating films into documentary and drama did not yet exist.
Moana (] ) is a 1926 American documentary film, or more strictly a work of "docufiction" that was directed by Robert J. Flaherty, the creator of "Nanook of the North" (1922).
William Henry "Bill" Duke, Jr. (born February 26, 1943) is an American actor and film director.
 Known for his physically imposing frame, Duke's work frequently dwells within the action and crime drama genres but also appears in comedy.
 He often plays characters related to law enforcement.
Robert Joseph Flaherty, FRGS ( ; February 16, 1884 – July 23, 1951) was an American filmmaker who directed and produced the first commercially successful feature-length documentary film, "Nanook of the North" (1922).
 The film made his reputation and nothing in his later life fully equaled its success, although he continued the development of this new genre of narrative documentary, e.g. with "Moana" (1926), set in the South Seas, and "Man of Aran" (1934), filmed in Ireland's Aran Islands.
 He is considered the "father" of both the documentary and the ethnographic film.
Frances Hubbard Flaherty (December 5, 1883 – June 22, 1972) was married to acclaimed documentary filmmaker Robert J. Flaherty from 1914 until his death in 1951.