Why use World Space instead of Screen Space?

Unity Engine
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What makes World space more preferable than the other?

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World space is generally 3D, in contrast to screen space being 2D.

Of course technically everything is 3D so… solve your problem however you would like!

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Preferable in what terms?

If I want the mouse cursor position, I prefer having the screen space.

If I want to know where in the game world an enemy is regardless of the camera, I would prefer world space. Especially if my game is 3d.

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