On one hand, Aurora Skies probably has more of a noteworthy and unique setting. I've heard it compared to Scandinavian/Nordic countries and Iceland. The sky (the auroras) would add some mood. It has hot air balloons, houses with grass roofs, it seems to include many more items (even without counting the Gold version). The dreary colors (compared to the other) would go against it for me, and the primary color saturated roofs aren't my thing.
Hidden Springs may be less noteworthy, but of the two, it's the one I'd personally be more interested in between these two (I'm really only interested in four of the store worlds and neither of these two are among them, although there's a second category of "sort of interested" consisting of two worlds of which Hidden Springs is a part of). I like its setting more, personally.
That being said, I think I'd probably suggest Aurora Springs. If I were to look at it as liking both equally (whereas I don't, which is why I prefer Hidden Springs), then I'd probably have to consider that Aurora Springs seems to include more new stuff, and in your case, the cost is similar since you'll be passing on the Gold version of it (were this not the case, I might suggest the other). So, unless you have a notable preference for one of the settings (in which case, go with that), then go with Aurora Skies. Only you know the best answer though (if majority says one then your gut says "wait" then maybe get that other); I was going to make a thread a month ago and ultimately decided what to get for myself, so good luck.
