We use Microsoft Authenticator as well as Microsoft SMS Authenticator. Normally, we enable MFA for all users who have email access and application access. Users can choose which authenticator they want to use. Based on their convenience, they enable Microsoft Authenticator or Microsoft SMS Authenticator. Almost 80% to 90% of users use Microsoft SMS Authenticator. Users who travel a lot choose Microsoft Authenticator.
We are using the latest version. It is updated by default, and we don't have to update the application. It is also automatically updated on mobile.