Aurora Skies with potato-ballad-sims' snow fix and Sunlit Tides are my top official worlds for sure. I love the Nordic architecture and climate of Aurora Skies (the night skies look even better with some of brntwaffles' lighting mods), this world really does feel like it should've been shipped with Seasons I will say.
I love the Polynesian and tranquil, laid back vibe of Sunlit Tides. I love how it doesn't feel like your typical tourist trap hyper modern vacation island, with the more traditional architecture. Definitely way better then Isla Paradiso (lol what's up with that lazy name?) that it makes me wonder why they didn't make it the world that came with Island Paradise instead. That being said I wish the water was a bit deeper to be able to add dive spots more easily, houseboats and those houses over water on stilts at least seem to be straight forward to add.
As far as other official worlds go, the only other one I could see myself playing in is Monte Vista maybe. I think it's country side Italian/French esque theme is neat, and it would be the perfect place to roleplay a mafia family.