The Squirrel Nut Zippers is an American swing band formed in 1993 in Chapel Hill, North Carolina, by James "Jimbo" Mathus (vocals and guitar), Tom Maxwell (vocals and guitar), Katharine Whalen (vocals, banjo, ukulele), Chris Phillips (drums), Don Raleigh (bass guitar), and Ken Mosher.
The Used is an American rock band formed in Orem, Utah, in 2001.
 The group consists of vocalist Bert McCracken, guitarist Justin Shekoski, bassist Jeph Howard, and drummer Dan Whitesides.
Johnny Vomit & The Dry Heaves was a high school garage band that formed in mid-1980s Corinth, Mississippi, that featured future leaders of the Oblivians and Squirrel Nut Zippers, Jack Oblivian (né Yarber) and Jim Mathus.
 Under the names Johnny Goopa (Yarber on drums) and Bart Barf (Mathus on bass), they supported Johnny Vomit on two seven-inch records issued on Eric (né Friedl) Oblivian's Goner Records.
Andrew Bird's Bowl of Fire was an American band fronted by musician Andrew Bird.
 After releasing his first solo album, "Music of Hair", Bird appeared on three albums by Squirrel Nut Zippers before becoming the bandleader for Andrew Bird's Bowl of Fire.
Squirrel Nut Caramels (chocolate flavored) and Squirrel Nut Zippers (vanilla flavored) are chewy caramel candy mixed with peanuts.
Bedlam Ballroom is the fifth studio album by the swing revival band Squirrel Nut Zippers, released in 2000.
 Most editions of the CD case have a lenticular cover.
 The cover artwork was created by artist Michael Doret.
Thomas Edward Maxwell (born September 19, 1965) is an American songwriter, musician, vocalist, and writer.
 Most notably Maxwell is the former lead singer of the swing revival band Squirrel Nut Zippers.
 He wrote the single "Hell" from the 1996 certified platinum album "Hot".
Roasted Right is an EP by the swing revival band Squirrel Nut Zippers that was released in 1997.
 Unlike other albums by the Zippers, brass and woodwinds were replaced by guitars and the blues.
Christmas Caravan is a Christmas album by the swing revival band Squirrel Nut Zippers that was released in 1998 by Mammoth Records.
James H. Mathis, Jr. (born August 1967), known as Jimbo Mathus, is an American singer-songwriter and guitarist, best known for his work with the swing revival band Squirrel Nut Zippers.

Question: which American band had more members, Squirrel Nut Zippers or The Used?
Answer: Squirrel Nut Zippers