Ive only had the expansion for a few months and after wandering around the game with my favorite loser churchill I recently started to look at some of the newer leaders. Charlemaigne is my tops so far. Even though I tend to expand too much too early with him I like the outside chance of getting judaism without being a rel civ. Plus his traits suit my game and how I set them up. Darius is really good but maybe too good with his traits. I like Gilgamesh as well. Early powah is always good imo.