Question: Who has had a solo singing career, Ryan McCombs or Toshimitsu Deyama?

Context paragraphs:
Ballad Collection (X Japan album): Ballad Collection is a compilation album released by X Japan on December 19, 1997.  It compiles all the ballads Yoshiki Hayashi wrote for the group.  Songs by other members such as "Voiceless Screaming" by Taiji Sawada and Toshimitsu "Toshi" Deyama are not included.  The album reached number 3 on the Oricon chart, and charted for 26 weeks.  In 1998, with 566,160 copies sold was the 47th best-selling album of the year.  It was certified platinum by RIAJ.

Ryan McCombs: Ryan McCombs (born July 16, 1974) is an American vocalist.  From 1997 to 2004 he was the vocalist of the rock band Soil.  McCombs has also served as the vocalist for alternative metal band Drowning Pool from 2005 until his departure in 2011.  He has since reunited with Soil.

Drowning Pool (album): Drowning Pool is the eponymous fourth studio album by American rock band Drowning Pool.  It was released on April 27, 2010 and is the band's first album not to feature a different singer, as Ryan McCombs remained with Drowning Pool after their 2007 album "Full Circle", although he did, however, leave the band in 2011 to rejoin his previous band SOiL.

Quentin Elias: Quentin Elias (10 May 1974 – 25 February 2014) was a French singer, actor and model.  Of Algerian heritage, he was the original lead singer of the French boy band Alliage with Steven Gunnell, Roman Lata Ares and Brian Torres from 1996 to 2000.  After his departure from the group, he relocated to the United States where he developed a solo singing career singing in English and French, releasing a number of albums, EPs and singles through his company Quentin Elias Music and distribution by Electro Boy Inc Records.  He also worked as a model, acted in a number of feature films, television series and on stage and was featured in a number of advertisements.  He took part in documentaries notably "The Adonis Factor" appearing on the documentary's promotional cover.  He was active in body training, tattooing, in photography and in active blogging of his progress, all the while releasing more materials online.  He was briefly involved in solo adult appearances on the Randy Blue gay male site under the pseudonym Q.  He made a comeback in France starting in 2011, appearing in a number of tours, made new releases for the French and European markets, including remakes of earlier Alliage hits and had a number of appearances on popular French reality television shows and on talk and entertainment shows talking candidly about his past.  On 25 February 2014, Elias died at his home in New York City.

Soil (EP): Soil is the first EP by the Chicago metal band SOiL.  According to the band's vocalist, Ryan McCombs, this release was referred to by the band as "the worm disc".  The tracks "Broken Wings" and "She" reappeared on a second EP, "El Chupacabra", in 1998.  Songs from both EPs then appeared on Soil's first album, "Throttle Junkies", the following year.

Whole (album): Whole is the sixth studio album by American metal band SOiL, released through Pavement Music on August 16, 2013 worldwide and August 20, 2013 in North America.  It is the first album since 2004 to feature Ryan McCombs on lead vocals, having returned to the band in 2011.  The the album was funded through Kickstarter .  The song "My Time" was released for backers only in December 10, 2012 .  The album version of "My Time" is slightly different.  The Kickstarter version of "My Time" was re-released in compilation album "Scream: The Essentials".  The band released their first single and music video for "Shine On".  "The Hate Song" and "Way Gone" were released as singles later.  The lyric video for the song "Amalgamation" was released on August 9, 2013 to promote the album.

Full Circle (Drowning Pool album): Full Circle is the third studio album by American rock band Drowning Pool, released on August 7, 2007.  It is their first of two studio releases with Ryan McCombs, then former singer of SOiL, who joined the band after the departure of Jason 'Gong' Jones in 2005.  The first single off the album, "Soldiers," is dedicated to the United States Army.

Toshi (musician): Toshimitsu Deyama (出山利三 , Deyama Toshimitsu , born October 10, 1965 in Tateyama, Chiba) , known exclusively by his stage name Toshi, is a Japanese singer and songwriter.  He is best known as the lead vocalist and a co-founder of the heavy metal band X Japan, which disbanded in 1997.  Toshi then went on to have an extensive solo career.  In 2007, X Japan reunited and began an ongoing world tour in 2010.  His distinctive, impassioned tenor vocals have been compared to those of Steve Perry.

Kitanoumi Toshimitsu: Toshimitsu Obata (小畑 敏満 , Obata Toshimitsu , May 16, 1953 – November 20, 2015) known as Kitanoumi Toshimitsu (北の湖敏満), was a sumo wrestler.  He was the dominant "yokozuna" in sumo during the 1970s.  Kitanoumi was promoted to "yokozuna" at the age 21, becoming the youngest ever to achieve sumo's top rank, and he remained a "yokozuna" for a record 63 tournaments.  He won 24 tournament championships during his career and was one of a series of truly great "yokozuna" who came from Hokkaidō, the northernmost main island of Japan.  At the time of his death he still held the record for most bouts won as a "yokozuna" (670).  Following his retirement in 1985 he established the Kitanoumi stable.  He was chairman of the Japan Sumo Association from 2002 until 2008, and from 2012 until his death.

Redefine (Soil album): Redefine (also styled as Re.De.Fine) is the third studio album by the Chicago-based rock band Soil.  The album was released on March 23, 2004, via J Records.  This was the band's final album with the vocalist Ryan McCombs before he left Soil in October that year.  "Redefine" was also Soil's last release through J Records after the band was dropped following the BMG/Sony merger.

Supporting paragraphs: Ryan McCombs Toshi (musician)
Answer: Toshimitsu Deyama