Give us a citation that makes you think he was the “best of the best”.
Beethoven was a very capable composer, and deserves a great reputation. He is not in the same category as Mozart.
I once had this conversation with a professor of organ performance at Stanford. She pointed out that, at best, Beethoven was a transition between the “Classical” and “Romantic” styles of Western European music. In comparison, Mozart was both a prodigy and a genius.
Mozart started out as a child prodigy. Had he died at age 16, he’d still be remembered for all his accomplishments as a child. From all accounts, he was as good a musician and composer at age 11 as any adult professional.
Mozart went on to set a standard of classical music, with a remarkably adroit mixture of lyrical melody and sophisticated harmony that even Shostakovich admired and copied. He was equally adept at writing concertos (for piano, oboe, and clarinet, among others), symphonies, operas, and other works. For each of these, he contributed enduring classics. I can’t think of any other Western European composer that can claim the same.
In comparison, Beethoven eventually became a symphonic master. He was very good as a young man, but no prodigy. His early symphonies are nice but hardly memorable, fashioned in a clearly classical style. I would say that the 5th, 7th, and 9th are his best, by far. He also contributed great piano works, but in defense of Mozart, the piano was a brand-new instrument during most of Mozart’s life. Beethoven’s operas are only so-so, though because of his reputation, they get played often.
Beethoven stands out because his symphonies have powerful melodies and structure, and show an intensity that Mozart lacked. Most of Mozart is light, airy, and a bit blithe. Only the Requiem shows maturity. In comparison, Beethoven’s 9th is awe-inspiring. Without the 9th, no Romantic movement.
Also, Beethoven’s music has entered the popular musical vocabulary, in a way that Mozart has not.
Finally, Beethoven broke the unfortunate mold that musicians, composers, and artists of all types had been forced into. He was among the first, and by far the most famous, composers who made a living composing and performing music on their own, instead of getting patronage. Bach made his living as a Kappelmeister. Mozart either struggled creatively under the idiot Emperor of Austria, or struggled monetarily on his own. Beethoven managed to survive in a middle/upper-class milieu. As a result, his death provoked a massive public mourning, and people lined the streets to watch his funeral procession.
And Mozart got buried in a potter’s graveyard.