UI Router conditional ui views?

My Solution:

angular.module('myApp')
.config(function ($stateProvider) {
    $stateProvider
        .state('main', {
            url: '/',
            controller: function (Auth, $state) {
                if (someCondition) {
                    $state.go('state1');
                } else {
                    $state.go('state2');
                }
            }
        });
});

where state 1 and state 2 are defined elsewhere.

If you're using UI Router, just create three states: the root state, with the '/' URL, and two direct descendant states with no URLs. In the onEnter of the root state, you detect the state of the user and transition to the correct child state accordingly. This gives the appearance of keeping the same URL for both child states, but allows you to have to separate states with separate configurations.

The templateUrl can be a function as well so you can check the logged in status and return a different view and define the controller in the view rather than as part of the state configuration