Hi Jamal,
I will suggest and recommend to look into and explore Azure AD authentication with Azure RBAC as this is best practice and will allow to you to control and manage user access from the central pane of AAD.
It also depends on the core requirements you have as both the options like AKS RBAC and Azure AD RBAC give you flexibility and control of the resources.
In terms of price and effective I would say Azure AD RBAC will be best if you are looking for long term horizon.
Check this article and the design decisions are critical so plan it accordingly. concepts-identity
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