I prefer source to 1.6 because the graphics don't look like crap. I also like being able to resize the crosshair so I don't have a 2 foot gap between it while I'm trying to aim at somebody's head (I hate crosshairs that don't actually cross. They're called crosshairs. They're so you can aim. Not so they can give you a general idea of where the center of the screen might be).
