As you know Confluence add-on may be built using "Velocity" (https://developer.atlassian.com/confdev/development-resources/confluence-architecture/confluence-internals/velocity-template-overview) or "SOY" (https://developer.atlassian.com/confdev/tutorials/writing-soy-templates-in-your-plugin) templates.
Which one do you prefer and why?
Which would you advise to use for a large project, built on the Confluence API?