Sunlit Tides, Riverview and Sunset Valley are probably my favorite EA worlds. Especially Sunlit Tides. (If you ignore the routing and lag). It's a really beautiful world! The IP world is also a very nice one, nature-wise, but horrible imo when it comes to annoying roads, routing and the island hopping that causes so many issues. Sunset Valley is a bit boring, but still one of the least buggy ones, has a lot of great characters, nice nature, well thought of-layout etc.
The Harmony world that someone made, is very nice. I love the city-feel of it, and it's VERY well made. Great details everywhere. Very little routing issues and lag compared to how PACKED it is. Kudos to who made it. (I forget their names)
I've tried sooo many worlds, and most of the time they look amazing but they never quite are what I want. Either they use the rabbit holes underground, (I prefer the rugs), or they have too many similar lots, (ya know why u never see sims on your lots? because you have SIX parks and SEVEN beaches, and ALL lots can be visited...just stop)
I wish my CAW wasn't so buggy, then I would have made more myself, but I can only make small flat islands.
PS, where is the best place to get a hold of worlds these days? I find it hard to find, especially because I don't have Generations, haha.