What's your favorite Chopin Etude?

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Some of Chopin's etudes are quite recognizable to everyone, such as the Revolutionary (Op. 10, No. 12). All of them are brilliant short (2-4 minutes) piano pieces. Tell me what you think of the Etudes, or if you have a favorite. I can't decide which one I like best, I really like the "Waterfall", "Torrent", "Revolutionary", and "Winter Wind". I'm learning to play them on the piano, it's a lot of work but worth it...