For me it'd definitely have to be generations! With so much content and personality it brings to every stage of life it was so amazing to me. Even elders got some content, gotta love Southern gentlemen lol. Prom, graduation, strollers, and so many other things that came with the pack that were incredible. It's incredibly sad that Sims 4 will probably never have an expansion pack like this but I've always loved Sims 3 more so it never bothered me. I'm currently waiting on the Sims 3 64 bit version to finally re-download generations and play for hours on end again!