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Theres 4 available in English on Steam
>8
>9v4
>PC Classic
>All Aboard Tourism (pic related)
Of these, all except PC Classic are 3D.
As far as complexity goes, they pretty much go in that order from least to most. 8 is not worth it at all at this point. 8 and 9 are true PC titles, whereas the other two were originally made for 3DS and Switch respectively, so UX is a bit worse on PC with them, but they are much more fleshed out with actual objective-based scenarios and more mechanics relating to the overall gameflow and urban development aspect. 9v5, which is NOT the Steam version and has no official western release (but a fan translation patch if you can get your hands on a Japanese version) has a handful of features specifically when it comes to detailed scheduling (splitting trains, turntables) that are not in the later two, and its not tile-based which has some pros and cons. Personally, I like Tourism the most. Its the most fleshed out mechanically when it comes to developing your cities, but 9 (v5 that is) can be nice as a much more relaxed sandbox if you happen to prefer the visual style and some of the detail options.
One issue with all of them is tutorials. 9 has none and PC Classic and Tourism have really awful ones that lock even basic features like speed control behind very slow spoonfeeding. Still, getting one of the latter, playing the tutorials until you feel you're going insane because of the glacial pacing and then just jumping into a proper scenario and learning things by doing and online guides is probably the most approachable way to get into them. If you dont care about objective-based scenarios, 9v5 and Tourism are pretty much a toss-up depending on which one you think looks better and whether you prefer the more complex mechanics of Tourism or the few train related options 9 has.
