Favorite expansion apart from seasons?

While I don't have Seasons and don't really plan on getting it at any point soon due to a lack of interest in it, I do have to say that my favorite expansion so far is City Living! I enjoy the singing skill a lot. It's my favorite part of the expansion. I always have my Sims sing because I find the bad singing to be entertaining. And the songs sound great when your Sim reaches a high level. I also enjoy the world that comes with it, as it seems more alive to me than the other worlds. There are always so many Sims walking around or doing various activities around the city. The festivals are also cool, although I don't usually have my Sims go to them that often.