What is Tchaikovsky's greatest work?

Out of all of the pieces of music that Pyotr Tchaikovsky wrote, which piece(s) is/are your favorite? Why?
I love his F minor symphony (symphony IV). The first movement starts with a fanfare in the horns and bassoons, but the trumpets steal it (the score also shows flutes, oboes, and clarinets playing with with the trumpets but they have hardly any effect) but than abandon it for the the horns to continue until it does out. Then the strings start a melody. That melody bounces around the strings and woodwinds until the the timpani shushes them and the trumpets play the fanfare and then the horns. After that a clarinet starts a different melody, one with swing. That melody grows, then the strings bring back their melody but in a happier version. Then the strings pick up energy but the trumpets try to bring happiness. Then the strings drop off the happy moment so the trumpets jump in with their fanfare many times. The timpani doesn't do a roll though so the strings and winds keep going. When the timpani does roll, the strings and winds don't shush, the just play louder than ever and then play their melody louder than ever. After that the bassoon takes up the clarinet’s melody and that develops t and then movement concludes.

The next movement starts with a beautiful oboe solo. The whole movement is not melancholy rather than forceful. The third movement starts with just pizzicato strings, than had quick winds, then staccato brass, then all the together.

The final movement starts with a lot major chord, after which the the winds and strings play a quick downward passage. After that a melody is put in the flutes and develops until the big chord comes back. Then that melody comes back and after that the chord comes and then a Russian folk tune is blasted triumphantly. After that the melody comes back and comes into a round between the trombones and trumpets. They then play a motif a second higher, then another and another until they come to the a-flat the fanfare in the first movement starts on. They play the fanfare and then die out. Some horns revive the Russian folk tune and the the chord and run passage followed by the Russian folk tune comes back and then the piece and very triumphantly.

For a runner up I would pick his D major violin concerto simply because of the spine tingling melody in the first movement.