I have seen infinity of post to try to choose by default an option in a dropdown. But I have not been able to achieve it. I have an array of some countries.
$sco
You can add a filter to your controller to get the default region (don't forget to add $filter after $scope):
$filter
$scope
$scope.defaultValue = $filter('filter')($scope.regions, {code: $scope.selectThisId.id}, true)[0];
and then add this to your select in your view
ng-init="select = defaultValue"
Demo