Question: Which group plays at more well-known festivals, Cowboy Junkies or Matt and Kim?

Context paragraphs:
Miles from Our Home: Miles from Our Home is the seventh studio album by Canadian alt-country band Cowboy Junkies, which was released in 1998.  It was their second and final album for Geffen Records.  The title track was a significant hit in their native Canada.  Following this album, the Junkies were dropped from the Geffen record label.  The Junkies moved to an independent label, Latent Recordings, for their subsequent albums.

Best of the Cowboy Junkies: Best of the Cowboy Junkies is a 2001 greatest hits compilation of Cowboy Junkies' songs recorded for RCA Records.  All songs are drawn from the band's RCA Records albums: "The Trinity Session", "The Caution Horses", "Black Eyed Man" and "Pale Sun, Crescent Moon".

Cowboy Junkies: Cowboy Junkies are a Canadian alternative country/blues/folk rock band.  The group was formed in Toronto in 1985 by Margo Timmins (vocalist), Michael Timmins (songwriter, guitarist), Peter Timmins (drummer) and Alan Anton (bassist).

Trinity Revisited: Trinity Revisited is an album and a film by the Cowboy Junkies, released on October 8, 2007.  It is a remake of the Junkies' most famous album, "The Trinity Session".  The new album was recorded in the fall of 2006 at Toronto's Church of the Holy Trinity, the same venue where the original album was recorded.

Matt and Kim: Matt and Kim (sometimes stylized Matt & Kim) are an American indie electronic duo from Brooklyn, New York.  The group formed in 2004 and consists of Matt Johnson (vocals/keyboards) and Kim Schifino (drums).  The duo is known for its upbeat dance music and energetic live shows which often incorporate samples from other artists.  Although they started their career playing shows in lofts and other close-quarters venues, they have since performed at numerous festivals, including Bonnaroo, Coachella, and the Firefly Music Festival.

Notes Falling Slow: Notes Falling Slow is a box set by the Canadian alt-country band Cowboy Junkies, containing remastered version of the 2001 album "Open", the 2004 album "One Soul Now", and the 2007 album "At the End of Paths Taken" on the first three discs, plus songs worked on during the creation of the three albums but not included.  Some of the tracks were not previously completed, some were not demoed, and others were cut but did not make the final set.  All these tracks have been newly recorded for this box set and included on the final disc, effectively creating a new Cowboy Junkies album.

At the End of Paths Taken: At the End of Paths Taken is an album by the Canadian alt-country band Cowboy Junkies, released in 2007.

Ars lunga: Ars lunga, Piano-Cello duo has been established in 2009 in Yerevan, Armenia, by two leading Armenian artists cellist Aram Talalyan and pianist Julietta Vardanyan, since then the group has performed numerous recitals across Armena, CIS countries, Far and Near East, Europe, Iran, participating in such well-known festivals as "The Return festival", "National Cello Festival" in Yerevan (Armenia) and "Fajr Festival" in Tehran (Iran), "Moscow Autumn" modern music festival, Contemporary Music Festival (Ukraine), Martisor Festival (Moldova), “Deia music festival (Spain)” and many others.  “Ars lunga” performed at such prestigious locations as Oji Hall (Tokyo), Moscow Composers Hall, Utrecht Conservatory, Vahdad Hall (Tehran), Organ Hall (Cisnau, Moldova) etc.  Since 2011 “Ars lunga” is active as NGO registered in Yerevan, Armenia.

Rarities, B-Sides and Slow, Sad Waltzes: Rarities, B-Sides and Slow, Sad Waltzes is an album by the Canadian alt-country band Cowboy Junkies, released in 1999.  It was the band's first independent release after the end of their contract with Geffen Records.  The album is a compendium of tracks that the band had recorded but not previously released on an album.  Two tracks has been released earlier as B-sides on Cowboy Junkies' singles, "If you Gotta Go, Go Now" on "Southern Rain" and "Leaving Normal" on "Anniversary Song".  It was released on both True North Records and Latent Recordings in Canada, and on Valley Records in the United States.

Lay It Down (Cowboy Junkies album): Lay It Down is the sixth studio album by the Canadian alt-country band Cowboy Junkies.  Released on February 27, 1996, it was the group's first album for Geffen Records after the end of their contract with RCA Records.  It was the band's first album that could be described as straight-ahead rock, rather than country rock, country or blues.  It was also their first album consisting entirely of original material, with no covers.  "A Common Disaster" and "Speaking Confidentially" were notable hits for the band on Canadian radio.

Supporting paragraphs: Cowboy Junkies Matt and Kim
Answer: Matt and Kim