Voodoo Zombie- they do whatever their told.
Night of the Living Dead Zombie- The dead return for the living. Their slow and they don't think.
28 days later zombie- spread by pretty much any contact, their fast, strong and viscious.
Return of the Living dead zombie- they can talk, they came from the ground or bites.
or if you have any other type of zombie your prefer.
It is more realistic. In the world today what do you think has a better chance of a world wide infection? Slow zombies that everyone knows about, or those fast fuckers that scare the shit out of you while are running away?