Source engine vs Doom 3's engine

Regardless of which camp you're in, Doom 3 and Half-Life 2 both upped the ante for PC video game graphics. But which is the better engine? Many words have been spoken about Valve's Source engine, especially the facial animation and AI. Doom 3, on the other hand, has had many words spewed forth on it's lighting.

Read on for a good head to head comparison of the two engines and their features. The writers conclusion makes sense. Now let's get some nice Machinma going in Doom 3.