Is is better to use transistors or op-amps for amplifiers built today?
It depends on what you want to achieve – a well designed discrete power amp still outperforms any power opamp, but good opamps outperform (technically, at least) any discrete circuit for preamps. However, the P37 (DoZ preamp) circuit is a good indicator of what can be done with only a few parts, and that measures well and sounds very good. There is no simple answer.
