There was a literal golden age of music in the Romantic Era. After WW1 music exploded and diversified down several trees. Mainly America trying to find culture. The expansion was influenced by black people popularising b5 in a penta scale to make blues (among many other technical changes) which greatly shaped the scales upon which music was made.
Tools became more accessible after synths and so we arrive at today, where anyone, including yours truly is capable of making music.
The best era for music was the Romantic Era, and it was the height of musical sophistication and expression. Genre wise, I don't have a preference, I only have unpreferences. I don't like rap for example, as that's often closer to poetry than it is to music.