I like perforated pages, it always lays flat and gives you an illusion of separate piece of paper. If you like the page could be removed without damaging the whole sketchbook. I was not comfortable with this before. The only thing is that materials used should be strong, not smudgy or it should be sprayed with fixative. I used watercolor(Bijou box) with water brush and Uranus pen for outlining.
Fire trucks on the road side.