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ORAS has the best map design and richest amount of variety and content, but wasn't as good as it absolutely should've been, so many will rate it lower than it is as for them a game that came out ten years prior provides the same experience but better.
SM is something different, which many will praise it for alone, but it has some pretty big design issues that may or may not bother people. Among its many core mechanic improvements there's also some bizzare omissions. Though on the other hand it's a notable step up from XY and ORAS in certain areas, namely PvE combat balance and character writing. In the end it's love or hate, either great or awful depending on what one prioritizes in the series.
XY is the safest of the three in every possible way and does nothing more than adequately. But, I would say nothing is outright awful in it, unlike SM, and it didn't absolutely blow any reasonable expectations, unlike ORAS.
