Bach’s music is a little too “mechanical” for my tastes. And, I would agree Beethoven was a better writer of music than Mozart. Mozart’s music was written by God.
My defense of Bach as the true channel of God's musical voice is as follows: I find perfection, intellectually and emotionally in the music of Bach. The music is so perfect that the medium is almost irrelevant. For instance, the first fugue of the WTC can be performed on harpsichord, organ, piano, synthesizer, string quartet, orchestra, choir, chorus and orchestra, kazoo band with a banjo - and with dynamics, without, fast, moderate, slow, and it will still be a miracle of music. It is pure. It is absolute. It is wide open to interpretation. Bach's music belongs to everybody and anybody. And to top it off, J.S. credited God for every composition "SDG" (Soli Deo Gloria).
The music of Mozart, as is the music of almost all other composers, is shackled to the instruments for which it was composed, and in this sense it is not pure and not absolute. and as a consequence, it is grounded to the material world. It is brilliant music for sure. An accomplishment of, and hence, and edifice to, the ego of a man. With God as an afterthought.