Yup. I guess the differenece is no dependency on angular-UI and it cuts straight to the bootstrap part.
The main difference between the two seems to be how they handle templates. UI Bootstrap has a set of default templates that can be overwritten, whereas AngularStrap doesn't. AngularStrap also includes date/time picker directives.
All three of them (angular-ui, ui.bootstrap, angular-strap) have been a pleasure to work with.