Question: Who had more artistic skills such as directing, Mario Bava or Val Guest?

Context paragraphs:
Bees in Paradise: Bees in Paradise is a 1944 British musical comedy film directed by Val Guest and starring Arthur Askey, Anne Shelton and Peter Graves.  It was produced by Edward Black at Gainsborough Pictures.  Co-written by director Val Guest and comic Marriott Edgar, who wrote for Will Hay and the Crazy Gang and composed some of Stanley Holloway's famous monologues; this is a lesser known Askey vehicle.

Hercules in the Haunted World: Hercules in the Haunted World (Italian: Ercole al centro della terra) is a 1961 Italian sword-and-sandal film directed by Mario Bava.  British bodybuilder Reg Park plays Hercules while British actor Christopher Lee appears as Hercules' nemesis Lico.  Shooting at Cinecittà, director Mario Bava used some of the same sets from the earlier "Hercules and the Conquest of Atlantis" which had already starred Reg Park.

Black Sunday (1960 film): Black Sunday (Italian: "La maschera del demonio"), also known as The Mask of Satan and Revenge of the Vampire, is a 1960 Italian gothic horror film directed by Mario Bava from a screenplay by Ennio de Concini and Mario Serandrei (with uncredited contributions by Bava, Marcello Coscia and Dino Di Palma), and starring Barbara Steele, John Richardson, Arturo Dominici and Ivo Garrani.  It was Bava's directorial debut, although he had completed several previous feature films without receiving an onscreen credit.  Based very loosely on Nikolai Gogol's short story "Viy", the narrative concerns a witch who is put to death by her own brother, only to return 200 years later to seek revenge on her descendants.

Mario Bava: Mario Bava (31 July 1914 – 27 April 1980) was an Italian director, screenwriter, special effects artist, and cinematographer from the "golden age" of Italian horror films.  His work kick-started the giallo film genre and the modern "slasher film".  His son Lamberto Bava later went on to become a noted horror film director in his own right.

Yesterday's Enemy: Yesterday's Enemy is a 1959 Hammer Films British war film in MegaScope directed by Val Guest and starring Stanley Baker, Guy Rolfe, Leo McKern and Gordon Jackson set in the Burma Campaign during World War II.  It is based on a 1958 BBC teleplay by Peter R. Newman, who turned it into a three-act play in 1960.  Gordon Jackson repeated his role from the BBC teleplay as Sgt. Ian Mackenzie.  Columbia Pictures co-produced the film with Hammer Films in an agreement for five co-productions a year with Columbia providing half the finance.  The film was shot on indoor sets in black and white and Megascope.  The film has no musical score.  Director Val Guest later said that "Yesterday's Enemy" was one of his films of which he was the most proud.  In 2013, film magazine "Total Film" included "Yesterday's Enemy" in their list of "50 Amazing Films You've Probably Never Seen".

Lamberto Bava: Lamberto Bava (born 3 April 1944) is an Italian film director.  Born in Rome, Bava began working as an assistant director for his director father Mario Bava.  Lamberto co-directed the 1979 television film "La Venere d'Ille" with his father and in 1980 directed his first solo feature film "Macabre".

Knives of the Avenger: Knives of the Avenger (Italian: "I coltelli del vendicatore" ) directed by Mario Bava.  Bava entered production when it was already in falling apart and re-wrote and shot the film in six days.

Val Guest: Valmond Maurice "Val" Guest (11 December 1911 – 10 May 2006) was an English film director and screenwriter.  Beginning as a writer (and later director) of comedy films, he is best known for his work for Hammer, for whom he directed 14 films, and science fiction films.  He enjoyed a long career in the film industry from the early 1930s until the early 1980s.

It's a Wonderful World (1956 film): It's a Wonderful World is a 1956 British musical film directed by Val Guest and starring Terence Morgan, George Cole, Mylène Demongeot (listed in the credits as Mylène Nicole) and Kathleen Harrison.  It also features Dennis Lotis, a popular singer at the time.  It was made at Shepperton Studios.  Songs include: "Rosanne", "When You Came Along", "Girls!  Girls!  Girls!"  (Ted Heath, Moira Heath), "A Few Kisses Ago" (Robert Farnon, Val Guest), and "The Hawaiian War Chant" (Ted Heath).

Eugenio Bava: Eugenio Bava (4 June 1886, Italy – 23 October 1966, Rome, Italy) was an Italian film cinematographer and is the patriarch of the Bava family.  His son was acclaimed film director Mario Bava and his grandson is Italian horror film director Lamberto Bava.

Supporting paragraphs: Mario Bava Val Guest
Answer: Mario Bava