Question: Who has been in more music groups Tom Petty or Saffron?
Context: This is the discography of Tom Petty, an American singer, songwriter and guitarist.  Petty has released thirteen studio albums as the lead singer of Tom Petty and the Heartbreakers in addition to three solo albums. Greatest Hits is a compilation album by Tom Petty and the Heartbreakers, released in 1993.  It is Petty's best-selling album to date and was certified 12× platinum by the RIAA on April 28, 2015.  The single "Mary Jane's Last Dance" became one of Petty's most popular songs, reaching #14 on the "Billboard" Hot 100 and #1 on the Billboard Mainstream Rock Tracks chart.  The other new song on the album is a cover of the Thunderclap Newman hit "Something in the Air".  The album contains no songs from 1987's "Let Me Up (I've Had Enough)".  However, three songs from 1989's "Full Moon Fever" were included; despite the album's technical status as a Tom Petty solo album, it contained contributions from several members from the Heartbreakers, thus legitimizing its inclusion on this compilation.  s of September 2011 , "Greatest Hits" had sold 7,464,000 copies in the United States, making it Tom Petty's best-selling album. "Stop Draggin' My Heart Around" was the first single from Stevie Nicks' debut solo album, "Bella Donna" (1981).  The track is the album's only song that was neither written nor co-written by Nicks.  Written by Tom Petty and Mike Campbell as a Tom Petty and the Heartbreakers song, Jimmy Iovine, who was also working for Stevie Nicks at the time, arranged for her to sing on it.  Petty sang with Nicks in the chorus and bridge, while his entire band (save Ron Blair, whose bass track was played by Donald "Duck" Dunn instead) played on the song. "Walls (Circus)" is a song written by Tom Petty and recorded by Tom Petty and the Heartbreakers.  It was released in July 1996 as the only single from their soundtrack album "Songs and Music from "She's the One"".  The song features Lindsey Buckingham on background vocals in a sheer Fleetwood Mac style.  The song peaked at number 69 on the U.S. "Billboard" Hot 100 chart.  The song was recorded at Sound City Studios by engineer Sylvia Massy.  An alternate arrangement of the song, played at a faster tempo, was included on the soundtrack under the title "Walls (No. 3)".  The song was later covered by Glen Campbell on his 2008 album "Meet Glen Campbell". Samantha Marie Sprackling (born 3 June 1968, Lagos, Nigeria) more commonly known as Saffron, is a singer, songwriter, actress and the lead singer of the electronica band Republica.  She also performed in London's "Starlight Express" for two years, appeared in the music video for the Chesney Hawkes hit, "The One and Only", and as a dancer in the music video for N-Joi's single, "Mindflux". Thomas Earl Petty (born October 20, 1950) is an American musician, singer, songwriter, multi instrumentalist and record producer.  He is best known as the lead singer of Tom Petty and the Heartbreakers, but is also known as a member and co-founder of the late 1980s supergroup the Traveling Wilburys (under the pseudonyms of Charlie T. Wilbury Jr. and Muddy Wilbury), and his early band Mudcrutch. "Mary Jane's Last Dance" is a song written by Tom Petty and recorded by American rock band Tom Petty and the Heartbreakers.  It was recorded on July 22, 1993, while Petty was recording his "Wildflowers" album, and was produced by Rick Rubin, guitarist Mike Campbell, and Tom Petty.  The sessions would prove to be the last to include drummer Stan Lynch before his eventual departure in 1994.  This song was first released as part of the "Greatest Hits" album in 1993.  It rose to #14 on the "Billboard" Hot 100, becoming his first "Billboard" Top 20 hit of the 1990s, and also topped the "Billboard" Album Rock Tracks chart for two weeks. "Jammin' Me" is the first single from "Let Me Up (I've Had Enough)", an 1987 album by Tom Petty and the Heartbreakers.  It is co-written by Bob Dylan, Tom Petty, and Mike Campbell.  The heartland rock tune has been included in Petty's 'best of' albums "Playback" and "". Highway Companion is the third solo studio album by American singer-songwriter Tom Petty.  It was released on July 25, 2006, and charted at #4 on the "Billboard" 200 album chart.  The album was produced by former Traveling Wilburys bandmate Jeff Lynne, who also produced Petty’s highly acclaimed first solo album, "Full Moon Fever", as well as the Heartbreakers' next album "Into the Great Wide Open".  Petty released the album through Rick Rubin's American Recordings label and Warner Bros.  Records, where Petty has had a record contract since his second solo album, "Wildflowers" (which was produced by Rubin).  The tracks "Saving Grace" and "Big Weekend" were released July 4, 2006 on the iTunes Music Store.  It ended up being Petty's only album for American Recordings, as that label moved to Columbia Records distribution in 2007; Warner Bros. retained the rights to Petty, eventually reassigning him to subsidiary label Reprise Records. "Make It Better (Forget About Me)" is a song written by Tom Petty of Tom Petty and the Heartbreakers and David A. Stewart of the Eurythmics.  It was released in June 1985 as the third single from Tom Petty and the Heartbreakers' 1985 album "Southern Accents".
Answer: Tom Petty