Classic FM Conversation - what is Beethoven's defining work?

As John Suchet's Beethoven series continues we would like to ask you, what one work is the most 'Beethoven' of all?

Ludwig van Beethoven 1803

Is it the heroic Eroica Symphony or Emperor Piano Concerto? Perhaps it's the struggle and triumph of the Fifth Symphony? Maybe it's the glorious, hugely influential Ninth Symphony? Of all his wonderful compositions, which do you think is Beethoven's defining work, best capturing his art? Tell us in the comments section below.