Comment by mooreds

It depends on your use case.

If you are a B2C app, you are probably more concerned about:

- social providers (Apple and Google being the big ones, but others could play a role--FB or Tiktok for example)

- easy registration (but not too easy, you want to avoid bot spam)

- self-service account management (updating profile fields, consents [CCPA, GDPR, others], resetting passwords

- single sign-on between your apps (if you have multiple)

- language support (for your backend, and mobile/web front end)

- cost

- possibly MFA, possibly passkeys