I use the Moleskine Sketchbook as a journal. I often like to adhere mementos to the pages, as well as draw diagrams and sketches, so I prefer the unlined, archival pages. Additionally, I am a bit touchy about ink showing through the back of the page, and find the thick pages of the sketchbook adequate for even a fine Sharpie. The pocket at the back is handy for odd receipts and such, and the elastic keeps larger notes in place. Also, I admit I get a cheap OCD thrill from the uniform line of perfect black books on the bookcase. And they smell divine.