Best EP: Get Together. The club system is very useful and makes for some great ways to play. There are a lot of Buy/build items along with CAS and the world of Windenburg is beautiful. It doesn't add a ton in terms of new gameplay, though. Also, clubs are currently broken atm so keep that in mind.
Best GP: I haven't played it yet, but Vampires looks amazing to me. The wall detailings alone are enough to make me want to buy that pack. However, If you're not into supernaturals, I'd go with either Dine Out or Spa Day. Both add a lot of build/buy content which can be used outside of restaurants/spas. SD's gameplay is more subtle than DO's, but I find I'm always using the wellness skill to keep my sims fit. DO also has quite a few annoying bugs at the moment in terms of running your own restaurant, but dining out works great.
Best SP: Movie Hangout is probably my favorite SP thus far. I really like the style they went for in that pack, and the movies are fun to watch with your sims, but the buy/build might not be for you if you're not into loud & colorful furniture. I would also recommend Vintage Glamour, the latest SP. A lot of the stuff is beautiful and quite versatile. Plus, there's two new beds. We could always use more beds in TS4.
