@[member="Hakan Venttuss"]
Sith Empire is dead, CIS have Templars so both would be a bad idea to join if you want to be a Sith Apprentice. My recommendation is the One Sith, the League of the Sith, or the Sith Council. There is also a Sith Temple in my Faction but ive yet to get any sith to actually join my faction so ya.