How could I get a list of users who are Admins or CMAdmins?

If you are trying to review your users to review permission settings, note that there is not currently a way to retrieve a list of users based on their account type within the UI. You can, however, use the API to retrieve this type of information. 

You can use the API and make a call such as: api/v1/users?fields=name,role,username,id&role=cmadmin&role=admin

With this call, you can expect to receive a list of users who have either the Admin or CMAdmin role, as well as their name, username, and ID. You can review our API documentation here for more information on the options available.