Originally posted by MF DELPH
Sam's smarter, but Dean's more lethal and more likely to get the job done, particularly when things get messy. It's like picking Ryu or Ken.
See, I disagree here. Sam's more lethal than Dean because he's so smart. Dean might be quicker to try and kill something but Sam would have the better chance of getting it done.
Also, when Sam goes "dark," he's a whole lot scarier than Dean. That's because, as the characters have mentioned, Sam is more like their father. He can become so focused on a target, he'll risk losing his soul (so to speak) to accomplish his mission of vengeance. Look at how he was when he was after Lilith or when tracking down the Trickster.