Do you prefer writing dialogue for good guys or bad guys, and why?

I'll go bad guys because, again, that's the shades of grey thing. I like it when bad guys aren't all bad. And it's also just fun to delve into, again, their motivations behind it and why and stuff like that. So, yeah, I would definitely... I mean, good guys are fun, too, because then you go the opposite way and go, how do you not make them white-hat paladin types, and how do you make them fun and flawed and interesting and engaging. But there's always something fun about writing the bad people.