Lesser known that Rachmaninoff #2, is the Brahms Piano Concerto #2 - but it is well worth the listen, if you have time.
There is a long standing debate about how to play Chopin. It is well-known that he was physically weak, and unable to play bombastically. Should all of his music be played more subtle, or should it be played as perhaps Franz Liszt (a contemporary and friend of Frederic Chopin) would most likely have played Chopin's music?
Most likely the answer will never be definitive, but I offer two piano samples I found on youtube... Which do you prefer?