Op Amp Buffer

Jfet Buffer

MOSfet Buffer

Do not forget to add a shunt resistor at the output of the circuit as in the JFET circuit
The difference in sound is, but it is difficult to describe it, it is necessary to compare all the schemes at once
The operational amplifier produces a neutral sound
Jfet adds brilliance (a more balanced sound)
MOSfet adds brightness and midrange
But the difference is so small that it is noticeable only in direct comparison, in a blind test you do not distinguish them and even do not understand whether there is a buffer or not