All three of these schematics are things I obtained from the internet. All of them are supposed to do the same thing: Make a 5vDC regulated power supply from the input of a car's 12-13vDC main power.

All of them have a 7805 regulator chip as their centerpiece. Each one is approximately the same schematic, but each one differs in the exact layout and values of the capacitors which are used. Does anyone know what the difference is among them, and why? In particular, why are the capacitor values different in each one, and what are the tradeoffs between each one of them?

Where I got each one of these schematics:
1: http://www.aaroncake.net/circuits/cdsupply.asp
2: http://www.instructables.com/id/Power-Your-Arduino-From-Your-Car/
3: http://anceop.com/?action=page&param=viewTutorial&id=78382

Note: For the first schematic image which does not contain values for the capacitors, the values in the accompanying text are:
C1 1 1000uF 25V Electrolytic Capacitor
C2 1 10uF 25V Electrolytic Capacitor
C3 1 1uF 15V Elextrolytic Capacitor
C4 1 0.1uF 15V Electrolytic Capacitor

Schematics attached.