While this is less prevalent these days, during the 4th and 5th console generations we'd see a great disparity of quality spread among machines. Companies often had a target platform and put most of its efforts into said target platform, ports playing second fiddle and sometimes suffering for lack of quality and/or content.
One case that comes to mind quite vividly is Sunset Riders - one of the most venerable classic run and gun games bar none, an artifact of a time when Konami meant something good, rather than something forgettable. Speaking of forgettable, this can quite nicely define the port the good old Mega Drive got saddled with for this game. Cut and simplified stages, poor color usage, missing playable characters... really a textbook example on how to not port something.
By contrast, the SNES got a port that for all intents and purposes was perfect by standards of the time: it had great palettes and all the content was present. I don't know if Sega is partially to blame for forcing Konami to use a cartridge with very little ROM space (likely, considering how Sega is famous for bad decisions) or if Konami got paid extra to make sure the SNES port were the superior product (also likely, Nintendo being Nintendo).
My hope is that the fan made port will finally do the venerable Mega Drive justice.
So there you go, that's my entry, feel free to add more examples and discuss.
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Mega Drive on the left, SNES on the right.