Generations and seasons were definitely my favorite expansion packs. They both add so much to the game and make the game fresh again.
Generations made kids and teens finally fun again (which was hard to do after the excellent kids and teens in the sims 2). In fact, this expansion made every life stage feel truly unique and fun. There were either new objects and interactions for practically every life stage in the game, new parties, improved weddings, and much more. While the content doesn't stand out at first sight, it integrates so well into the game that it is basically impossible not to use many of the features in daily sim life.
Seasons also is a pack that effects the whole game. Weather and seasonal activities shake up the game making days, or at least each season feel more unique. The seasonal activities and fairs also add a plethora of group activities that kids and older can partake in (something this game was missing at the start).
My least favorite EP is probably into the future (which was not even mentioned on the poll). This is probably because the content doesn't really ingrate into many situations, unless you specifically want to engage with future stuff.
