Meanwhile in Sims 3

Since Sims 4 ain't going to launch until this Autumn there is plenty of time to rediscover the Sims 3, and all the expansions there!
I personally enjoy starting over from nothing and making my way up into the rich people's world.
While doing so I realised which expansions I can't live without; Seasons where the seasons are changing and there are new activities for every season.
University, where I can educate my Sims even more, to make it possible to get a better job in the end.
On top of that I love the expansions where you can go out shopping etc.

Which expansion is your favorite? Do you have any preferences for Sims 4's expansions?