Question: Who has more scope of profession, Serj Tankian or John Reis?

Context paragraphs:
Empty Walls: "Empty Walls" is a song by musician Serj Tankian.  The song was released as the first official single and first track off of Tankian's debut solo album "Elect the Dead".  The song has been described as a "traditionally pummeling rocker".

Enter the Chicken: Enter the Chicken is the fourteenth studio album by musician Buckethead.  The album was released on October 25, 2005 by Serj Tankian's label Serjical Strike.  It has 11 songs, two of which are less than twenty seconds long.  It contains appearances from such artists as Saul Williams, Maximum Bob, Efrem Schulz and Serj Tankian.

Cool Gardens: Cool Gardens is a poetry book by the lead singer of the band System of a Down, Serj Tankian.  It was published by MTV Books and was released on October 1, 2002.  It is a collection of seven to eight years of Tankian's reflections on life, and features artwork by fellow Angeleno, Sako Shahinian.  The poetry, like the songs of System of a Down, consists of a reflection of societies and people's wrongs.  It portrays what people do to themselves and the control others try to hold over them.

Serart: Serart is a collaboration album by two international Armenian musicians: Serj Tankian ("Ser-"), lead singer of System of a Down, and folk multi-instrumentalist Arto Tunçboyacıyan ("-art").  It was the first release on Tankian's own label, Serjical Strike Records.

Elect the Dead: Elect the Dead is the debut album by rock musician Serj Tankian, lead singer and founding member of Armenian-American metal quartet System of a Down.  It was released on October 22, 2007.  Alongside Tankian appears Armenian-American coloratura Ani Maldjian, drummers John Dolmayan from System of a Down and B. Brain Mantia of Primus and Guns N' Roses, Dan Monti on guitars, as well as a string section featuring Antonio Pontarelli.

Ghost Ship (album): Ghost Ship is the first album by the San Diego, California, rock and roll band Sultans, released in 2000 by Swami Records.  Both the band and the album began as "side projects" for John Reis during time off from his main band, Rocket from the Crypt.  This was also the time at which Reis formed Hot Snakes.  Reis collaborated with drummer Tony Di Prima, bringing in Rocket From the Crypt guitarist Andy Stamets while Reis himself played the bass guitar (he is normally known as a guitarist).  The band chose the name Sultans for the project and recorded an introductory EP and "Ghost Ship", both of which were released that year on Reis' newly formed Swami label.  As Reis has a tradition of using different stage names or pseudonyms in his various projects, he chose to be known as "Slasher" in the Sultans, while Stamets chose the nickname "Black Flame".

Sky Is Over: "Sky Is Over" is a song by Serj Tankian.  The song was released as the second single from Tankian's debut solo album "Elect the Dead".  The song has charted on both the Modern Rock Tracks and the Mainstream Rock Tracks in the US.

John Reis: John Reis (born 1969) and also known by the pseudonyms Speedo, Slasher, and The Swami is an American musician, singer, guitarist, record label owner, and disc jockey.  He is best known as the singer and guitarist for the rock band Rocket from the Crypt, which he formed and fronted (as Speedo) for the entirety of its career from 1990 to 2005.  Prior to this he was the guitarist in the post-hardcore band Pitchfork, and also played in Drive Like Jehu during the early 1990s.  In 1999 he formed the Hot Snakes, and in 2000 also formed the Sultans, in which (as Slasher) he sang and originally played bass before switching to rhythm guitar.  He played in both these bands until their breakups in 2005 and 2007 respectively.  He also released a solo recording under the name Back Off Cupids, which was recorded in 1994 but not released until 1999.  Over the years he has performed in many other musical acts including Conservative Itch, Stacatto Reads, Custom Floor, and Beehive & the Barracudas.  He is the owner of Swami Records, a label he founded in 1999 (he uses the title The Swami in this capacity).  He frequently works with bands in a studio capacity and releases albums by many southern California groups through his label.  He also hosts the "Swami Sound System" program (previously on San Diego radio station 94.9 (KBZT), and now available on Slacker Radio).  Reis remains an influential figure in the San Diego underground music community and is currently performing with a new band named The Night Marchers.

Elect the Dead Symphony: Elect the Dead Symphony is the first live album by System of a Down frontman Serj Tankian.  It is available in CD, CD/DVD, LP, and Digital Download formats.  It features the Auckland Philharmonia Orchestra at the Auckland Town Hall in Auckland, New Zealand.  Orchestral arrangements were by John Psathas.  Material for the performance is from Tankian's solo debut, "Elect the Dead" with some additional previously unreleased songs.

Serj Tankian: Serj Tankian (Western Armenian: Սերժ Թանկեան , ] ; born August 21, 1967) is a Lebanese-born Armenian-American singer-songwriter, composer, multi-instrumentalist, record producer, poet, and political activist with Armenian descent.  He is best known as the lead vocalist, songwriter, keyboardist, and occasional live rhythm guitarist of the metal band System of a Down, formed in 1994.

Supporting paragraphs: Serj Tankian John Reis
Answer: Serj Tankian