What is the difference between a two button and three button switch and what is it for?

When ordering should I select a two button switch or a three button switch?

Two Button switch has two switches that you tap to enable cruise or beep the horn.

The three Button switch has three on/off switches. It has a horn switch, cruise switch and a thrid on/off switch. The third button is a togle switch that people commonly use for additional options like lights, reverse etc.