The SG version was changed to the name "Authoritative Tone."
The SS version is a great active power that is definitely benefited by the SG power. The problem with the SS version is just how easily it can be spammed, imo. It can be a powerful one-trick pony.
Really you can be a face without ware OR PP, so I consider stuff like the SG version and Cool Resolve to be good, but can also be overkill.
That said, Leadership is an okay skill by itself. Commanding Voice makes it a strong pick, but it's another skill investment at the end of the day. Leadership is a good skill if you have nothing better to spend your actions on (which isn't always the case and imo shouldn't be the big case).
