EmberJS: When should I use the Torii vs Ember-Simple-Auth

I'm trying to learn authentication for a web app that I'm writing. All I want is a login and password, and to make sure the user can't write/edit each others posts unless they are logged in.

I'm not sure I fully understand it. But it seems that Torii is better if you need to do Facebook or Google authentication, whereas simple-auth is better for just logging in. Is that correct? Is there other things Torii can do that Simple-Auth can't? Are there things that Simple-Auth can do that Torii can't?