i hope i wouldn't have to choose, but if forced onto the bench and told to play the busoni piano concerto or die, i would put my head under the lid and swiftly knock the support. the busoni concerto sounds like he couldn't decide which composer to emulate the most. you go through liszt, tausig, beethoven, etc. and can actually hear each one as it passes. the piano comes in out of nowhere. was it a symphony or a piano concerto (i'm confused). and then at the end, all of a sudden shock (it's from shock to shock to shock) a chorale.
compared to beethoven's 9th, this is a travesty. he was not an 'original' composer. he borrowed too much.
not to say that i don't appreciate the words, but the chorale might stand on it's own. i don't want to wait that long for it as it doesn't tie in. would rather it was JUST a symphony, or JUST a piano concerto, or JUST a chorale.