[ogazitt]

Thanks for the question! Those are both great projects. Topaz combines the best elements of both:

* It uses OPA as its decision engine and Rego as the policy language, and supports the "policy as code" methodology

* It also implements a ReBAC directory, much like OpenFGA, in the same container image. It goes further, by allowing you to store not just relationships between subjects and objects, but also properties... which makes it easy to author policies that combine attribute-based (ABAC) and relationship-based (ReBAC) rules.