Probably my favorite type of game, I've played dozens of them but I'm always looking for something good I might have missed. My personal favorite for the past few years has definitely been Farthest Frontier but theres been a ton of good ones. And if anyone else is looking for recommendations let me what you like and I probably know something that fits.
I don't have a permanent favorite, I've always enjoyed Caesar 3(Augustus), Cities Skylines, Workers, Banished, Farthest Frontier. All have their strengths.
The latest one I enjoyed is Against the storm, its pretty damn good.