Question: Who was a better selling artist, Onew or Sonya Scarlet?

Context articles: Pleasure and Pain (Theatres des Vampires album)
Notis Sfakianakis
The Addiction Tour 2006
Candyland (album)
Onew
Sonya Scarlet
Mandoza
Fabian Varesi
David Jost
100% Hell

Pleasure and Pain is the seventh studio album by the Italian gothic metal band Theatres des Vampires.
 It is the first album after Lord Vampyr's departure, and the first to feature Sonya Scarlet as the main vocalist of the band as well as being the last to feature Robert Cufaro on guitar.
Panagiotis "Notis" Sfakianakis (Greek: Νότης Σφακιανάκης; born 2 November 1959) is a Greek singer of Folk music, and is one of the most commercially successful artists of all time in Greece and Cyprus.
 Sfakianakis began his career in 1985, opening at nightclubs for other artists.
 He was discovered by Sony Greece and released his debut album "Proti Fora" (1991).
 For his second album "Eisai Ena Pistoli" (1992), he moved to Minos EMI.
 While his first three releases were commercially successful, beginning in the mid-1990s, Sfakianakis released a series of multi-platinum albums that are among the best selling albums of all time in Greece — including "Notioanatolitika Tou Kosmou" (1994) with 120–150 thousand copies sold, "5o Vima" (1996) which has been recognized as the best selling album of all time in Greece with 200 thousand copies sold, "I Notes Einai 7psyhes" with 132.5 thousand copies (265 thousand units) sold, the EPs "Pro-Dia-Fimin" (1997) with 100 thousand copies sold, and "Around the World" with 15 thousand copies shipped, "XXX Enthimion" (1999), which is the best selling live album of all time in Greece in terms of unit sales with 180 thousand copies (360 thousand units) sold, "Polihroma Kai Entona" (2000) that shipped 100 thousand copies and "As Milisoun Ta Tragoudia" (2002) which fared similarly.
 His signature song "O Aetos" is one of the most popular songs in Greek music history.
 Sfakianakis was the best selling artist of the 1990s and stands as the best selling Greek artist of his generation.
 However, in the 2000s he faced a significant commercial decline.
 "Me Agapi O,ti Kaneis" (2004) and "Ana...Genisis" (2005) shipped 40 thousand copies each.
 "Nihtes... Magikes" (2007) and "Mnimes" (2008) sold 30 thousand copies each, while the EP "Kinonia Ora 07:00" sold 15 thousand copies.
 He then embarked on the "Matomeno Dakry" album trilogy (2009–2011).
 He has sold over 5 million records in Greece alone and in addition to these he has sold over 900 thousand copies of his albums as newspaper covermounts. Sfakianakis is also known for his controversial image and outspoken manner and opinions.
The Addiction Tour 2006 is the first live DVD by the Italian gothic metal band Theatres des Vampires.
 It features ten songs recorded during the tour in 2006 and also features an interview with Sonya Scarlet, as well as two music videos the band had recorded for the songs "Lilith Mater Inferorum" and "Angel of Lust".
 The live songs were also released as a live album in the band's next release, Desire of Damnation.
Candyland is the tenth studio album by Italian gothic metal band Theatres des Vampires, released through Scarlet Records on 14 October 2016.
 Initially announced on 7 July 2016, it is their first studio album in 5 years since "Moonlight Waltz", and also their first release with guitarist Giorgio Ferrante, who replaced Stephan Benfante early in 2016.
 It is noticeably more guitar-driven than the band's previous releases with Sonya Scarlet on vocals, and its lyrics focus less on the vampiric and occult themes the band is famous for.
 A music video for the track "Morgana Effect" was uploaded to the band's official YouTube channel on 29 September 2016.
Lee Jin-ki (born (1989--) 14, 1989 ), better known by his stage name Onew, is a South Korean singer and actor.
 Born in Gwangmyeong, Gyeonggi-do, Onew was discovered at the 2006 S.M. Academy Casting and signed the contract with S.M Entertainment the day after his audition.
 He debuted as one of the lead vocalists of boy group Shinee in May 2008, who went on to become one of the best-selling artists in South Korea.
Sonya Scarlet (born 2 April 1980) is the singer and lyricist of the Italian extreme gothic metal band Theatres des Vampires.
Mduduzi Edmund Tshabalala (January 17, 1978 – September 18, 2016), also known as Mandoza, was a South African kwaito musician.
 Known for his hit singles such as Nkalakatha, Tornado, Sgelekeqe, Godoba and Indoda which topped the charts in South Africa and all over the african continent, his second album Nkalakatha released in 2000 became the biggest selling album in his career selling 350 000 units which made him a big African celebrity and a Kwaito multi-platinum selling artist to have come out of the African continent.
Fabian Varesi (""Necros"") is the keyboardist and main composer of the Italian extreme gothic metal band Theatres des Vampires.
 He also performs backing vocals for the band, along with Zimon Lijoi and Gabriel Valerio.
 He joined the band in 1997.
 Fabian can also play the electric and bass guitars, but his skill in them is not strong enough to be on stage, so when composing he often only plays long enough to get the idea to the player who will take it to the stage.
 Fabian is also the general manager of an Action Figure Company named Kaustic Plastik, and this is his main work.
 He is composing several tracks for the sound track of Cult of Lamia, which Sonya Scarlet will be playing a vampire in this horror film.
David Jost (born 12 August 1972) is an international music producer, singer-songwriter and DJ, born in Hamburg, Germany.
 His career as an international songwriter, music producer and remixer has a track record of 74 platinum & 108 gold records and 14 No. 1 hits.
 He has worked with platinum selling artist including Lady Gaga, Chris Brown, Tokio Hotel, Limp Bizkit, Selena Gomez, Nelly Furtado, Keri Hilson, Aura Dione, and Adam Lambert.
 For Tokio Hotel, David Jost has composed, produced and mixed six platinum selling #1 Hit Singles and three platinum selling #1 albums, he also has developed the band and is managing them.
 Tokio Hotel became the biggest international rock band to come out of Germany within two decades.
 Jost's work with Tokio Hotel lead to 87 media-awards, including 4 MTV European Music Awards, the MTV Video Music award Japan, 4 MTV Latin Music Awards including song of the year for "Monsoon" and also the US MTV Video Music Award (Moonman).
 Even though Jost managed several careers of big media artists, he only rarely answers interviews for the press and is known for principally never giving TV interviews.
 For his work as a songwriter, Jost was named Germany's best songwriter (Rock & Pop) by the GEMA (the German equivalent to the ASCAP/BMI).
 Jost is currently working in his Los Angeles studios.
100% Hell is the sixth album of the Italian Extreme Metal band Necrodeath.
 Cronos of Venom is the guest vocalist on "February 5, 1984", Federica Badalini of Soul Takers plays keyboards on "Identity Crisis", Sonya Scarlet of Theatres des Vampires make a duet with Flegias on "100% Hell".