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. Alexi Laiho:  He has previously played with Thy Serpent and Impaled Nazarene on occasion, as well as Warmen and Hypocrisy. Jónsi: Jón Þór "Jónsi" Birgisson (] ) (born 23 April 1975) is the guitarist and vocalist for the Icelandic post-rock band Sigur Rós.
i don't know