One of the major issues with other cloud cost management tools is they separate from your management and deployment tools. You rely on tags or other metadata being added by engineers to gather data for your reports.
With ePaaS cloud cost management is built into the tool. This allows us to accurately understand what has been deployed without relying on engineers or developers remembering to add that metadata.
Knowing what's been deployed, when, by who and for which project also allows you to create complex relationships between resources so you get a much more accurate picture of who's spending what, and where.