It could be better to choose as admin (perhaps even better during install procedure) if you want to have the possibility to be logged in as a normal user. I don't know which could be the best way to do that, but I think it would be useful in the upcoming period, even to prevent legal procedings regarding privacy.
You can go to app\View\Themed\Adm\Users\admin_index.ctp and remove line "<a href="javascript:void(0);" data-id="<?php echo $user['User']['id']; ?>" class="btn btn-default login_as_user"><?php echo __('Login as user' ?></a>"
2
votesDisabling the admin capability to be logged in as a normal user