Pens.
Pencils and crayons don't feel as precise or as aerodynamic under my grasp and thus I cannot use them
I can hardly see the impression that they're trynna make
Pens are elegant, simple and sophisticated. A fine example of exquisite architecture. So therefore I must say, verily, Pens.
The common wooden pencil is to me the best tool of this group in terms of reliability, the ability to remove errors, and the ease in creating different shades during the drawing of greyscale works.
I got used to writing with ink in 12th grade English, so that's what I use now. Really like the black .38mm Pilots.
But I use pencil for math. Otherwise I have no problem with simply dashing a line through my written mistakes in ink.