I have both pages and office hd and frankly office hd isn't worth the money. it runs slow and does not seem to have the formatting features of pages. However, it's file management is a bit better.
I use pages with a BT Mac keyboard as a replacement for my netbook I used to travel with. Except for the limited formatting I find pages is a great basic WP program. Now if I had to type solely on the screen I would probably have a MB Air.