The difference between push button switch and selector switch,
The major differece is,
the push button switch is operate by hand to push it and make the circuit ON,
The selector switch have the knob, have two position and three position for you choose, when you turn right the switch will ON, turn back the switch will off.
All the type according to customer habit, push button switch have better looking and more shape for choose, and used more than selector switchs.