Safer. And provides easy switch from one Desktop environment to another: ie; kde3 to kde4. It is also easier to address solutions to graphical issues with auto-login off.
if systemd did not change this*, I know two places where one can configure suche thing:
/etc/sysconfig/displaymanager DISPLAYMANAGER_AUTOLOGIN="". If empty, no auto login. Can also be changed via YaST/system
in the kde systemconfig, login screen, tab “commodities”
but at least a friend of mine just said that He had problem and he found a solution but couldn’t explain what to me, so mai be this is not all the anwser (openSUSE 13.1)
sometime systemd do not anymore use the /etc/sysconfig variables