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I feel like both the initial release and the ultra release are two portions of a complete, decent game. Ultra has a much better climax and properly explores Ultra Space instead of just teasing it.
But it also completely fucks up Lusamine's story AND ruins the climactic reveal of Nebby's final form. Both things the games spend WAY too much time building up to fuck over. So it makes it feel like nether is the definitive version. At the same time, playing both is a serious chore due to unskippable cut-scenes.
Also, It's hard to really enjoy the games at all till you accept that Lillie is the main character and you're just her chauffeur. Which I imagine doesn't work for a lot of people.