To say that ONE album is the best among more than sixty very good ones may seem at least strange. But if you go through all of them here at Amazon, you will see that every single Zappa cd  has at least one review saying "the best". To me, IF I HAD TO PICK ONE, that would be Over-nite sensation. Some of his best songs are here, mixing the intrincated riffs and not-of-this-world tempos, with beautiful melodies and tasty playing ( from all musicians ).