I'll be not-Sith for this one. :p (Also! Forgive me if the grammar of my post sucks. I have an infant chewing on one of my arms while I type with the other. lol)
I've always considered the pen to be mightier. Like the sword, it is destructive, protective, solves problems, and is involved with war. The pen is capable of so much more than that, though. In addition to those reasons, it also can create peace, it scribes our histories, we communicate with it, artists use it to make poems and stories, we use our pens to write notes of forgiveness and apologies, pens are the starting drafts for essays, blueprints, and so much more!
I'll leave it brief since commenters after me will more than likely have more detailed responses. Our pens are precious tools that we must use until the ink runs out. :] Even then, we'll never run out of ink because people will never run out of ideas.