We could not find any site that provides detailed quantitative reviews of the document automation solutions available. (In fact, we found almost no detailed reviews of any enterprise software.) So we hired SoftwareSuggest, a well respected independent site to write reviews of each of the products, including Windward.
You will note that there is no rating for each product. That's because which product is best for you is very dependent on your use case. Reducing each to a score is as nonsensical as Yelp rating the "best" dessert. The products are listed in alphabetic order (which does not favor Windward).
Conga Composer is the first document generation application to launch on the Salesforce AppExchange. Composer can create personalized documents from your Salesforce data at the click of a button. Conga Solutions integrates with your workflows to save you valuable time and resources. Conga Orchestrate seamlessly automates the generation and approval process.
Read: Conga Document Generation Review
Go to: Conga website
Nintex simplifies document creation in Salesforce using the same data and documents you use today. This transforms documents into automated business processes that accelerate sales and business results, empowering employees to do more of what they do best. Document generation processes can be activated with the click of a button, by batch, or workflow, with users never having to leave the familiarity of Salesforce.
Read: Nintex Document Generation Review
Go to: Nintex website
Windward's product suite spans the gamut from a comprehensive SaaS or desktop solution, to seamless integration in your CRM or custom apps. Create visually dynamic documents that look precisely the way you want, incorporating all your business logic right in the template. Windward delivers visually stunning designs, smart document logic, an incredibly intuitive interface, and significant time & cost savings.
Read: Windward Document Generation Review
Go to: Windward website
Read: Reviews of additional DocGen & Reporting software products not in the above list. Primarily older products that are reporting (as opposed to docgen) focused.