I worked on Beethoven 3 for a few months preparing for a competition and it was the most rewarding musical experience I had experienced. The music is absolutely profound, and I never tired of it. Chopin 2 is exceptionally beautiful, and I personally feel much more at home in Chopin's expressive language than in Beethoven, but after a while it does become apparent that the Chopin was a work of a young prodigy, the Beethoven of an already established master. I am not familiar with the Saint-Saens, but I do not imagine it can hold a candle to Beethoven.