Best answer: As of now, Grounded does not offer multiple versions or editions, instead just offering Grounded through Early Access or Game Preview.
That doesn't mean Obsidian Entertainment won't offer multiple versions or editions when the game officially releases.
Grounded is still a ways out from being released, and will only be available through Early Access or Game Preview starting July 28, 2020, up until its eventual full release.
Still, we do know that if you're interested in Grounded, an open-world survival game that shrinks players down to the size of mere insects, all you have to do is wait until July 28, 2020, and buy the Early Access or Game Preview of Grounded from Steam or Microsoft.
Alternatively, all subscribers to Xbox Game Pass will have access to Grounded day one, both in its Game Preview and its eventual final release!