Question: Which opera had more acts,  Il trovatore or Attila?
Context: The Max Maretzek Italian Opera Company (sometimes referred to as the Italian Opera Company, the Italian Grand Opera Company, or Academy of Music Opera Company) was a touring American opera company that performed throughout the United States from 1849-1878.  The first major opera company in Manhattan and one of the first important companies in the United States, it had a long association with the Academy of Music in New York City where it presented an annual season of opera from 1854 until the company's demise in 1878 There the company performed the United States premieres of "Rigoletto", "Il trovatore", and "La traviata" among other works. Attila is an opera in a prologue and three acts by Giuseppe Verdi to an Italian libretto by Temistocle Solera, based on the 1809 play "Attila, König der Hunnen " ("Attila, King of the Huns") by Zacharias Werner.  The opera received its first performance at La Fenice in Venice on 17 March 1846. Il trovatore (] ; Italian for "The Troubadour") is an opera in four acts by Giuseppe Verdi to an Italian libretto largely written by Salvadore Cammarano, based on the play "El trovador" (1836) by Antonio García Gutiérrez.  It was Gutiérrez's most successful play, one which Verdi scholar Julian Budden describes as "a high flown, sprawling melodrama flamboyantly defiant of the Aristotelian unities, packed with all manner of fantastic and bizarre incident." Riccardo Massi is an Italian operatic tenor who had performed at such Italian theatres as both the Giuseppe Verdi Theatre and La Scala.  He became known for his role as Mario Cavaradossi in "Tosca" which he performed in autumn of 2011 at the Bavarian State Opera and then performed again at the Berlin Opera Theatre in November of that year.  His US debut was in February 2012 as Radames in "Aida" at the Metropolitan Opera following by another summer performance that year.  In the autumn of 2012 he sang in "Il trovatore" staged by the Canadian Opera in Toronto and in February 2013 sang Calaf in "Turandot" produced by the Royal Swedish Opera.  He also became known for his performance as Don Alvaro in "La forza del destino" at the Australian Opera and the same year sang in another "Aida" production, this time at the Michigan Opera Theatre.  From 2013 to 2014 he performed at the Royal Opera House and as Cavaradossi at the Liceu in Barcelona.  Later on, he returned to Royal Swedish Opera where he sang the title role in "Andrea Chenier" and then another "Radames" at the Houston Grand Opera.  At the Opernhaus Zurich, he sang Calaf in December 2015. Manitoba Opera is an opera company in Winnipeg, Manitoba that was founded in 1969.  Its first production was a concert version of Giuseppe Verdi's "Il Trovatore" in 1972.  Manitoba Opera is one of several western Canadian opera companies that flourished under the so-called "father of opera in Western Canada," Irving Guttman.  He has been instrumental in the development of many young Canadian singers, including Winnipeg native Tracy Dahl (soprano) and Winkler's Phillip Ens (bass).  Both have gone on to international careers. Simon Boccanegra (] ) is an opera with a prologue and three acts by Giuseppe Verdi to an Italian libretto by Francesco Maria Piave, based on the play "Simón Bocanegra" (1843) by Antonio García Gutiérrez, whose play "El trovador" had been the basis for Verdi's 1853 opera, "Il trovatore". Aleksandrs Antoņenko (born in Riga June 26, 1975) is a Latvian tenor who specializes in dramatic repertoire.  He debuted on stage as "Prince" in "Rusalka" in 2009.  Since then, he has performed in cities such as Baden-Baden, Berlin, Monte Carlo, and Stockholm.  Notable appearances include a 2012 appearance in Tosca, as Cavaradossi, at La Scala.  In the same year he was seen as Otello at the Royal Opera House in London.  In 2013 he appeared in the role of "Radames" in "Aida" at the Zurich Opera House.  He followed that performance by appearing as Manrico in Il Trovatore at the Berlin State Opera.  He has also performed in "Turandot" as Calaf at La Scala.  In 2013, he appeared in the role of "Ismaele" in Giuseppe Verdi's opera "Nabucco", conducted by Nicola Luisotti at the Teatro alla Scala, Milan as well as the Splendid Palace in Latvia.  In 2014 he announced that he will perform at The Orchestra Hall in "Cavalleria rusticana" and "Pagliacci".  He will also appear as the title role in the Metropolitan Opera's new production of "Otello", which will open the Met's 2015-2016 season.  The production is notable within American opera circles due to the Met's decision to abandon their tradition of blackface for the role of Otello.  Other future performances include "Norma" at the Bavarian State Opera, "Otello" at Barcelona's Gran Teatre del Liceu and Zürich's Opernhaus, and "Pagliacci" at the Royal Opera House in London. This is a partial discography of Giuseppe Verdi's opera "Il trovatore" ("The Troubadour") and "Le trouvère" (the revised version in French translation).  At least 83 recordings exist of the opera as a whole, made between 1912 and 2011, although not all of them are absolutely complete.  Of these, 45 are live audio recordings, 22 are studio audio recordings, and 16 are videos or movies.  "Il trovatore" was first performed at the Teatro Apollo, Rome on 19 January 1853.  "Le trouvère" was first presented on 12 January 1857. Plácido Domingo has made hundreds of opera performances, music albums, and concert recordings throughout his career as an operatic tenor.  From his first operatic leading role as Alfredo in "La traviata" in 1961, his major debuts continued in swift succession: "Tosca" at the Hamburg State Opera and "Don Carlos" at the Vienna State Opera in 1967; "Adriana Lecouvreur" at the Metropolitan Opera, "Turandot" in Verona Arena and "La bohème" in San Francisco in 1969; "La Gioconda" in 1970; "Tosca" in Royal Opera House, Covent Garden in 1971; "La bohème" at the Bavarian State Opera in 1972; "Il trovatore" at the Paris Opéra in 1973 and "Don Carlo" at the Salzburg Festival in 1975, "Parsifal" in 1992 at the Bayreuth Festival; and the list continues until today; the same role is often recorded more than once. Elena da Feltre is an opera in three acts by 19th-century Italian composer Saverio Mercadante from a libretto by Salvatore Cammarano, well known as librettist of Donizetti's "Lucia di Lammermoor" and Verdi's "Il trovatore".  The premiere took place at the Teatro San Carlo in Naples on 1 January 1839 as part of the Carnival Season.  While not successful at the time, the opera was revived at La Scala in 1843 with twenty performances.
Answer: Il trovatore