Typically, an organization (not a workspace) is the better choice going forward. For example, organizations have teams, and workspaces do not. But you should be aware of all the differences, costs, etc. You can find this information in How to use Asana, Asana tutorials, onboarding tips, and team use cases | Product guide • Asana Product Guide, and here in the Forum by searching, but again, I’d start with one of those sources above for advice.