They are all so good in their own way. If I only could pick one it would be Nightlife or Apartment Life because I feel like they all integrate so good into the life simulation experience and yet offer new things.

The BIg Five! My favorite place to be in South Africa was hands down the Kruger Parc. Seeing wild animals was just awesome.

To stay on topic. I think my favorite EP is OFB. I love running businesses even if I suck at building them.

I'd have to pick OFB also, the variety and re-playability it added to the game is fantastic.

I can't really decide, i love all expansion packs. They all add something to the game.

By far I would still say Nightlife it added so much to our game play, next would be OFB than Seasons those are my three favorite, but I love anything that is Sims 2.

I would say either Seasons or University. Never been a fan of traveling and opening up businesses.
I try to keep my game realistic so I don't need witches and stuff Apartment Life adds. I do like living in apartments though.

This is a tough one - Seasons and OFB are tied for me as favorite EP's. They both added so much variety to the game. However, I truly love every EP and SP...as they all made the game feel complete in some way.

I agree. Bon Voyage used to be my favourite, and probably still would be the one I would pick if I could only choose one EP to add to my game, but I'd really miss pets, weather, hobbies, university...

The only EP I really don't care for is Nightlife, which I know is a lot of people's favourite, but it just really didn't add anything to my game or fit with my playstyle. I could also probably play without OFB as I rarely start businesses (I just like the interactions and clothes that it comes with haha).