I am wondering, why are some Bode plots made with \$f\$ or frequency of signal representing x-axis, and why other Bode plots use \$\omega\$ or angular frequency of signal representing x-axis? Why don't all use same quantity (in my opinion, frequency)? But even if one may be using angular frequency for plot, and other may be using frequency for plot, two plots will look exactly the same...
Do you use angular frequency with imaginary unit \$j\omega\$ when plotting complex poles and zeros onto Bode plot? Or is there any other reason?
Also \$rad/sec\$ doesn't equal to \$Hz\$ so this is another fact that confuses things up.