Who has performed as a member of more musical groups, Alexi Laiho or Jónsi?
Alexi Laiho:  He is best known as the lead guitarist, lead vocalist and founding member of the melodic death metal band Children of Bodom, and is also the guitarist for Sinergy and Kylähullut. Jónsi:  Apart from Sigur Rós, Jónsi also performs together with his partner Alex Somers as an art collaboration called Jónsi & Alex.
i don't know