Question: Which artist is in more bands, Stacey McClean or Hansi Kürsch?

full_context: Document 1: Stacey McClean: Stacey McClean (born 17 February 1989) is an English solo singer. She was part of the S Club spin-off band, S Club 8 and in 2009 took part in the sixth series of "The X Factor".
Document 2: List of The X Factor finalists (UK series 8): The eighth UK series of "The X Factor" was broadcast on ITV from 20 August 2011, with the live shows starting on 8 October 2011. Girl group Little Mix were the winners, and the runner-up was Marcus Collins. After "The X Factor", several of the contestants went on to release singles, including Little Mix, Collins, Amelia Lily, Misha B, Frankie Cocozza, The Risk and 2 Shoes. On 25 July 2013, three contestants from series 8 - Little Mix, Amelia Lily and Misha B - were included in the (three-minute 41-second) X Factor Ultimate Mash-Up, a video trailer for series 10, a selection of 13 tracks and artists chosen to represent a decade of 'The X Factor' artists impact on the UK national chart.
Document 3: Klaus Meine: Klaus Meine (born 25 May 1948) is a German vocalist, best known as the lead singer of the hard rock band Scorpions. He and guitarist Rudolf Schenker are the only two members of the group to appear on every Scorpions album. Meine was placed at #22 on Hit Parader's Top Heavy Metal Vocalists of All Time list in 2006.
Document 4: Blind Guardian: Blind Guardian is a German power metal band formed in the mid-1980s in Krefeld, West Germany. They are often credited as one of the seminal and most influential bands in the power metal and speed metal subgenres. Ten musicians have been a part of the band's line-up in its history, which has consisted of singer Hansi Kürsch, guitarists André Olbrich and Marcus Siepen, and drummer Frederik Ehmke since 2005.
Document 5: The X Factor (UK series 8): The X Factor is a British television music competition to find new singing talent. The eighth series commenced airing on ITV on 20 August 2011 and ended on 11 December 2011. The winner was Little Mix, a four-piece girl group known earlier in the series as Rhythmix, consisting of members Jesy Nelson, Perrie Edwards, Leigh-Anne Pinnock, and Jade Thirlwall. They became the first act in the groups category to win in the UK show's history with new judge Tulisa emerging as their winning mentor. Dermot O'Leary presented the main show on ITV, while Caroline Flack and series 6 runner-up Olly Murs co-presented the spin-off show "The Xtra Factor" on ITV2, replacing Konnie Huq from the previous year. Louis Walsh returned to the judging panel and was joined by Gary Barlow, Kelly Rowland and Tulisa. Barlow, Rowland and Tulisa joined the panel as replacements for former judges, Simon Cowell, Dannii Minogue and Cheryl Cole. Series 5 winner Alexandra Burke served as a guest judge for week 4 of the live shows due to Rowland having a throat infection.
Document 6: Demons and Wizards (band): Demons and Wizards is a power metal band conceived as a side-project by vocalist for Blind Guardian, Hansi Kürsch, and the guitarist for Iced Earth, Jon Schaffer. Schaffer writes the music and Kürsch writes the lyrics. The band's line-up during the recording of their first album in 1999 also featured Mark Prator, who was the drummer on a few Iced Earth albums, and Jim Morris doing most of the guitar solos, Morris also having worked with Iced Earth in the past.
Document 7: Rochelle Humes: Rochelle Eulah Eileen Humes (née Wiseman; born 21 March 1989) is an English singer and television presenter, best known for her work in pop groups S Club 8 and The Saturdays. Humes has achieved six Top 10 hits with S Club 8 and thirteen Top 10 hits with girl group The Saturdays, including number-one hit "What About Us".
Document 8: The X Factor (UK series 6): The X Factor is a British television music competition to find new singing talent. The sixth series started on ITV on 22 August 2009 and was won by Joe McElderry on 13 December 2009. Cheryl Cole emerged as the winning mentor for the second consecutive year, the first time in the show's history that a mentor has won back-to-back series. The show was presented by Dermot O'Leary, with spin-off show "The Xtra Factor" presented by Holly Willoughby on ITV2. McElderry's winner's single was a cover version of Miley Cyrus's "The Climb". Public auditions by aspiring singers began in June 2009 and were held in five cities across the UK. Simon Cowell, Louis Walsh, Minogue and Cole returned as judges. This season was the first to be sponsored by Talktalk after they took over the sponsorship from The Carphone Warehouse. For the first time, auditions were held in front of a live audience. Following initial auditions, the "bootcamp" stage took place in August 2009, where the number of contestants was narrowed down to 24. The 24 contestants were split into their categories, Boys, Girls, Over 25s and Groups, and given a judge to mentor them at the "judges' houses" stage and throughout the finals.
Document 9: Andi Deris: Andreas "Andi" Deris (born 18 August 1964) is a German singer and songwriter, best known as the lead vocalist of power metal band Helloween, and co-founder and former lead singer of German melodic metal band Pink Cream 69. He has an active solo career, as well as his own recording studio in Tenerife.
Document 10: S Club 8: S Club 8 (formerly S Club Juniors), were a spin off of the British pop group S Club 7. The group's members, Frankie Sandford, Jay Asforis, Daisy Evans, Calvin Goldspink, Stacey McClean, Aaron Renfree, Hannah Richings, and Rochelle Wiseman were all in their early teens or younger when they were chosen from thousands of hopefuls on the television series "S Club Search" in 2001.
Document 11: Hansi Kürsch: Hans Jürgen Kürsch, better known as Hansi Kürsch (born 10 August 1966 in Lank-Latum/Meerbusch, Germany), is a German musician best known for being the co-founder, lead vocalist, co-composer, and lyricist of power metal band Blind Guardian. He was also the bassist in Blind Guardian until the 1998 album "Nightfall in Middle-Earth". He also provides lead vocals for the band Demons and Wizards.
Document 12: André Olbrich: André Olbrich (born 3 May 1967, in Düsseldorf, Germany) is a German guitarist, composer and backing vocalist, most known as the co-founder and lead guitarist of power metal band Blind Guardian, in which he serves as one of the main composers with other co-founder Hansi Kürsch.
Document 13: Stevie McCrorie: Stevie McCrorie (born 23 March 1985) is a Scottish singer-songwriter. He is best known as a firefighter who won the fourth series of the BBC television singing competition "The Voice UK" in 2015. He auditioned with Kodaline's "All I Want", with all four coaches turning their chairs for him. His debut single, "Lost Stars", was released the day following his win and reached number six on the UK Singles Charts, number one in Scotland and eighty-seven in Ireland. Since winning 'The Voice', he has performed at T in The Park.
Document 14: Jon Schaffer: Jon Ryan Schaffer (born March 15, 1968) is an American heavy metal musician. He is best known as the guitarist and last remaining original member of the Florida-based heavy metal band Iced Earth, which he formed in 1985 under the name "Purgatory". He also sings in his side project Sons of Liberty and played guitar for Demons and Wizards, his collaboration with Blind Guardian frontman Hansi Kürsch.
Document 15: Michael Kiske: Michael Kiske (born January 24, 1968) is a German singer best known as the lead vocalist for the German power metal band Helloween. After his departure from the band, Kiske recorded four solo albums, participated on various metal and rock related projects, such as Avantasia, Place Vendome and Kiske/Somerville, while he also performed with numerous bands as a guest vocalist. In late 2009, he formed the hard rock / heavy metal band Unisonic and began touring again after 17 years of absence. On November 14, 2016 it was officially announced that Kiske will tour again with Helloween and Kai Hansen in 2017 and 2018.
ground_truth: Hansi Kürsch