What piece was Beethoven's most important?

While opinions may vary, many consider Beethoven's Symphony No. 9 to be his most important work. Completed in 1824, it features the famous "Ode to Joy" choral finale, which celebrates unity and brotherhood. This symphony not only showcases Beethoven's innovative orchestration and emotional depth but also had a profound impact on the symphonic genre and Western music as a whole. Its themes of hope and humanity continue to resonate widely today.