Hurr hurr, definitely wooden.
I always have a sharpener on me, and use only the good pencils like Staples brand ones (or I just steal some of the school ones). Mechanical pencils suck when it comes to doodling and drawing, which is what I'm doing 75% of the time in my classes anyway.
Besides, the mechanical pencils are always breaking. I write dark, fast and in script; having the stupid thin lead snap on me while I'm on a writing roll (like on an essay) is frustrating.
And pens? I hate pens. I'm a neat freak, make too many mistakes and I never have any white-out on me.
So yeah, wooden FTW.