This was harder to answer than I thought. I haven't actually played Dogs/Cats a lot yet (took a break around the time it was released) so that wasn't really an option for me lol. I had to go with City Living because apartments can be a lot of fun, I like the festivals (though they always feel like they come and go too fast...) and lot traits are a favorite feature of mine, especially since you can change them whenever you want (looking at you, gremlins).
Get together is second because it's so useful for large families. I make a club just for the family and start gatherings while everyone goes about their day. The club approves of things like cleaning, repairing and gardening, so they'll actually focus on those things even when I'm not controlling them and man is that helpful.
