I don't know if I agree with what you said about playing for a famous program. What you said at the beginning applies to both situations. Sometimes they are more impressed with pianists who can play a slow movement beautifully, which is often 100 times more difficult than playing a fast/furious piece. Trust me, they see enough of those. Much of the time, they would much rather hear a beautifully played Chopin Nocturne as opposed to an etude.Remember, music isn't about showing off.