Neither, my favorite (I can't remember the exact wording) is when GlaDOS is about to try to kill you and it says something about you being the "immediate past president of the 'being alive' club."
Or a close second is Cave Johnson's: "The average human male is about 60% water, now here at Aperture we find that a little bit extravagant. We're going to point some jet engines at you and see if we can't get that down to something more reasonable like 20 or 30 percent." (again probably not exact wording)
Also... that's 4 quotes, not 5... see? 4.