Gonna save the SoTL a little longer. The carolean, as I mentioned before, is good, but not quite continent clearing. So it's not quite good enough for complete domination, but still screws your reputation and negates your UA.
It doesn't even have to be an offensive unit. It is actually better as defensive one, and picking Faith Healers as a Pantheon and fortifying these guys next to a city they will heal 50 hp each turn, even as it attacks the enemies trying to siege said city. I'm guessing you haven't tried using them like that yet. Easily one of the (if not the) best UUs in the game, and easily beats most of the things left on this list, the SoTL being one of them.