I always wear pants b/c that is what I am comfortable in. I think first impressions are very important, and you should make yourself look professional. Pant or Skirt though I do not think matters. Just make sure everything is clean and wrinkle free and looks smart on you & is appropriate, of course.
I wore a pant suit on an interview where I know the superintendent was obsessed with dressing well & he complemented me on how I was put together.