//Augustus wins for being the guy all the other emperors want to be :D//

Well, at least part of that is because while lots of emperors wanted to be remembered for various magnificent deeds or lands conquered, Augustus (although he gave plenty of publicity to his deeds) most wanted to be remembered for being a good ruler.

(Also, he had Livia, and whatever else anyone may think of her, they pretty much all agree that she was TERRIFYINGLY competent.)