I really liked Civ 4 for some of the fantasy mods like Orbis(?), but after Civ 5 came out, that primarily what I've played since then. I've played a little of Civ Alpha Centauri, and haven't touched Civ 6 mostly because Stellaris came out around the same time and then I got busy with school.
I have almost 3000 hours into Stellaris at this point. I may have a problem.