So, original art comes in all different sizes, shapes and colors. I have pencil only pages, I have ink pages and I even have some with the lettering taped on. I love all the pages I own, each is different but I think just the straight up pencil pages are my favorite. I get to see how the penciler orginally drew the page before ink, colors, lettering made it onto the page. Though when you compare it to a ink page, its night and day.
The example that pops into my head first is a page I have from Michael Turner that is just pencil and it is fantastic. When compared to pages he had inked, his style is almost lost. In no way am I trying to start a penciler/inker battle.
So what is your preference?