I would guess pens, since they're more re-usable and last longer. Although pencils are bio-degradable...

i'm thinking that pens are totally disposable and being made of plastic, they just sit in landfills forever

pencils seem to grind down as they get sharpened and eventually decompose

i'm thinking that it might be the lesser of two evils...

Except for how much wood goes into a single pencil. There is a huge amount of waste. And the graphite production is bad for environment

graphite is not lead, so it's not as toxic.

i'd have to believe that the energy used to create a wood pencil is less than creating a plastic pen.

a biodegradable pen made with little energy and resource would do the trick.

remember how bugs bunny taught us pencils were made.

i just found a pen that is made from corn. i think that one wins.