When it comes to document editing and creation on the iPad, two solutions really stand out: Apple's iWork Suite (Pages, Numbers, and Keynote) and DataViz's Documents to Go app. Which is better? Well, I wish the decision was that easy.
Both apps (or set of apps in iWork's case -- you can buy each separately) allow you to edit and create documents, spreadsheets and presentations. iWork also has the advantage of using Apple's iWork format and Office format as well and is beautifully designed. Documents to Go does a stellar job of rendering and editing Microsoft's Office format. Let's begin by looking at each app a little more in-depth. I will focus primarily on the differences of how each application handles their word processing since this is the number one reason people would use these apps and, you probably don't want a mini-novel to read. There is an incredible amount to discuss with both iWork and Documents to Go, I cannot conceivably cover it all here. My goal is to give you a detailed enough overview to help you decided which app will work best for you.