Favorite Sims 2 EP?

Wow! That question had me looking at it for quite a while. Honestly, ALL of the EPs had great things to offer. Even the ones I don't particularly play much of, in my case Nightlife. For this poll, I chose Open For Business because it let's my stay-at-home parents create a good income for the family. I don't think I ever reached a level 10 business when I played all those years ago but I currently have two level sevens and thing they will eventually hit 10 if the owner lives long enough. That's a fun challenge for me as is seeing my Sims be all proud of the items they created to sell. One family has a clothing shop and the entire family has jumped in to make clothes for it. The cool thing is my other families have those clothes in their closet since they stopped by to buy them.

Seasons added so much realism and I love the weather changes.
Pets is so much fun with all the furry "kids" around, just like my RL.
Freetime gave some great hobbies and for more than one of my sims, a career.
Bon Voyage makes for great honeymoons.
Apartment life had value. Some of my founding sims chose to get an apartment when they started out with nothing.
University, while not my cup of tea, gave more careers and extra wants/fears.
Nightlife, while I don't play it much, gave us a number of things like CARS.

The lists of benefits for each EP would be pages long. Honestly, I can't imagine not having any of these EPs.