Ok now, I now that there in no "versus" as far as comparing these majestic composers. I was wondering however about the age-old question. I would like to ask the learned, perhaps preferably those who have played the concertos the following questions. Is Rachmaninov's 3rd piano more difficult pianistically than Tchaikovsky's first? Which has a more difficult keyboard work?
Piano concertos: Rachmaninov Vs. Tchaikovsky