Question: Which author had more national origins, Charles Bukowski or Helen Dunmore?

Context paragraphs:
Bukowski (1973 film): Bukowski is a 1973 documentary film produced by Taylor Hackford and directed by Richard Davies that follows Los Angeles poet Charles Bukowski to San Francisco for a poetry reading.  The full 60-minute documentary begins with footage of Bukowski in his Los Angeles home and neighborhood as he discusses his history as a postal worker as well as his approach to and perspective on poetry.  The film then shows him flying with Linda King to San Francisco for the poetry reading followed by interactions with attendees after the show.  One night the window of his room is broken during a fight between some guests and then a fight between Charles and Linda causes her to leave.  Interviews follow with Liza and Linda about their relationship with Charles.  Bukowski is shown betting at the track and explaining his betting strategy.

Ham on Rye: Ham on Rye is a 1982 semi-autobiographical novel by American author and poet Charles Bukowski.  Written in the first person, the novel follows Henry Chinaski, Bukowski’s thinly veiled alter ego, during his early years.  Written in Bukowski’s characteristically straightforward prose, the novel tells of his coming-of-age in Los Angeles during the Great Depression.

Henry Chinaski: Henry Charles "Hank" Chinaski is the literary alter ego of the American writer Charles Bukowski, appearing in five of Bukowski's novels, a number of his short stories and poems, and in the films "Barfly" and "Factotum".  Although much of Chinaski's biography is based on Bukowski's own life story, the Chinaski character is still a literary creation that is constructed with the veneer of what the writer Adam Kirsch calls "a pulp fiction hero."  Works of fiction that feature the character include "Confessions of a Man Insane Enough to Live With the Beasts" (1965), "Post Office" (1971), "South of No North" (1973), "Factotum" (1975), "Women" (1978), "Ham on Rye" (1982), "Hot Water Music" (1983), "Hollywood" (1989), and "Septuagenarian Stew" (1990).  He is also mentioned briefly in the beginning of Bukowski's last novel, "Pulp".

One Tough Mother: One Tough Mother is a box set of the unedited final two readings writer/poet Charles Bukowski ever gave, even through he lived and wrote for another 14 years.  It includes interviews with the director of Bukowski documentary Born Into This, a short film of the 25th Anniversary of the Vancouver reading, and a short film of a celebration of Bukowski at the Huntington Library in California.  It is produced by Dennis Del Torre and Jon Monday and directed by Jon Monday for mondayMEDIA distribution.

Zennor in Darkness: Zennor in Darkness, was the debut novel from English author Helen Dunmore, published in 1993.  It won the 1994 McKitterick Prize.  which is awarded for debut novels for writers over 40.  Until that point Dunmore was primarily a poet though had published short stories and books for children.  As a result of winning the prize, Penguin offered her a two-book deal and fiction became her focus.

The Charles Bukowski Tapes: The Charles Bukowski Tapes are a collection of short interviews with the American writer/poet Charles Bukowski, filmed and assembled by Barbet Schroeder and first published in 1987 in the USA.  Today, the video documentary is considered a cult classic.

Charles Bukowski: Henry Charles Bukowski (born Heinrich Karl Bukowski; August 16, 1920 – March 9, 1994) was a German-American poet, novelist, and short story writer.

Bukowski (2017 film): Bukowski is an upcoming American biographical film.  It retells the childhood years of writer Charles Bukowski.  The film was directed by James Franco and stars Josh Peck as Charles Bukowski, Tim Blake Nelson as his father, Henry, and Alex Kingston as his mother, Katharina.

Helen Dunmore: Helen Dunmore FRSL (12 December 1952 – 5 June 2017) was a British poet, novelist and children's writer.

Barfly (film): Barfly is a 1987 American comedy drama film directed by Barbet Schroeder and starring Mickey Rourke and Faye Dunaway.  The film is a semi-autobiography of poet/author Charles Bukowski during the time he spent drinking heavily in Los Angeles, and it presents Bukowski's alter ego Henry Chinaski.  The screenplay, written by Bukowski, was commissioned by the French film director Schroeder, and it was published (with illustrations by the author) in 1984, when film production was still pending.

Supporting paragraphs: Charles Bukowski Helen Dunmore
Answer: Charles Bukowski