Which opera, if any,  Venus and Adonis or Bluebeard's Castle has more acts ?
Venus and Adonis (opera) Venus and Adonis is an opera in three acts and a prologue by the English Baroque composer John Blow, composed in about 1683. It was written for the court of King Charles II at either London or Windsor. It is considered by some to be either a semi-opera or a masque, but "The New Grove" names it as the earliest known English opera.
Romeo und Julie Romeo und Julie is a singspiel in three acts by composer Georg Benda. The opera has a German libretto by Friedrich Wilhelm Gotter that is based upon Christian Felix Weiße's translation of William Shakespeare's play "Romeo and Juliet".