the difference between a zombie and a ghoul

I was wondering about this the other day after playing Fallout 3 at my brother’s because there are lots of ghouls in the game but no zombies. Some of the ghouls are sane (albeit horrific looking) and you can talk to them, trade with them, and get information from them. But other ghouls – mainly the ones who live in the abandoned subways – are like zombies, mindless killing machines. And like zombies, the only way to kill a ghoul for sure is to shoot it in the head, otherwise, there’s a good chance it will re-animate and come after you again. Thankfully they aren't too hard to kill - unless they come in a swarm, then you better have something semi-automatic or run.

Anywhere, for those who care to know:

A zombie is a reanimated corpse or a human who is being controlled by someone else by use of magic with some media renditions using a pandemic illness to explain their existence.

A ghoul is a folkloric monster associated with graveyards and consuming human flesh, often classified as undead. The oldest surviving literature that mention ghouls is likely One Thousand and One Nights. The term is first attested in English in 1786, in William Beckford’s Orientalist novel, Vathek, which describes the ghūl of Arabian folklore.

There's also another fun game my brother has called Left for Dead, in which you're in a zombie infested city with three companions and you have to find/fight your way to safety. This is a multi-player game so my brother and I can play together. But I still like Fallout better.

So, do you prefer zombies or ghouls?