The only sith I can think of that could acually cheat death was darth sion (lord of pain). And he could only use that power on himself as far as I know. Sidious however could transfer his essence between body's. something he never bothered to teach Vader by the way. IMO Anakin was evil from day one and Sidious could sense it. Even the Jedi council could sense it. Even if Anakin knew the truth that Sidious could not bring back the dead he would have fallen anyway. (Sooner or later).