The first image shows the Kindle and Kobo bookshelves, and the second image shows 2 different views of the iPad bookshelf.
The second set compares the bookstores. The Kindle Store is actually in the browser. I like it, but it's really not optimized for touchscreens. The Kobo Bookstore and iBookstore are both in the apps.
The Kindle app and iBooks both support landscape and portrait modes. Unfortunately, the Kindle app doesn't have a multi-column or 2 page view. This is a deficiency it shares with the Kindle DX.