I like them all, but Into the Future is very self contained so I could remove this expansion and most of my regular gameplay would be the same. World Adventures is fairly self contained as well, but I really enjoy it more honestly.
Plus, the release windows made the experience night and day. World Adventures was the beginning adventure of 3 and Into the Future was looking into the future by hinting at 4.
Into the Future and World Adventures set the standards for how I want alternate worlds/timelines and vacations done in the Sims series, so I still appreciate them both greatly, but I could do most I do normally without Into the Future.
