Better for what? Seems like this is a matter of opinion. (i prefer 2d; "real-d")
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There no difference at all. Imax just has a bigger screen and better sound. In my opinon i would prefer RealD 3D
This is a total matter of opinon. 3D gives better graphics, but 2D is easier to draw or make.
Its better in the middle
Paper is a 3D object.
a Sphere is a 3d circle