I have tested the WordPress app on an android smartphone recently and was a bit disappointed with it, the whole thing was twitchy and unresponsive. The format of the iPad's screen makes the app easier to navigate and easier to use.
You can write a post, check your spelling, and create links without having to write a single line of code or HTML. Uploading an image is simple to do - overall this app is an exceptional little tool.
You can add multiple self-hosted and WordPress hosted blogs to the app and take control - brilliant
You can moderate, edit, or reply to comments from the simple to use console, making it easier to stay in touch with your fans and readers. Swipe a comment to reveal a quick moderation menu and for popular posts, you can quickly bulk moderate comments through the intuitive interface.