Are you more articulate, intelligent, and eloquent as a speaker or a writer?

Definitely a writer...and for all the reasons you mention. I'm generally a pretty articulate person...except when I'm angry. I have kind of a hair-trigger temper and say things before I think, and end up saying things that I'm not positive I mean...but I'm angry, and I need to put those feelings someplace...and that's usually on the shoulders of the poor person standing in front of me...When I write my feelings out though, I have the chance to think about what I'm feeling and sometimes realize, even as I write, that maybe I'm overreacting.