Is there a "correct" answer to this question? Surely they produce two quite different images. The curved plane version will have more-or-less the same resolution/sharpness over the whole field of view, as the distance from the pinhole to each point on the film is (roughly) the same. In the anamorphic case, part of the film is much closer to the pinhole, so that part of the film image will have a different sharpness to the part of the film farthest away from the pinhole.
Or am I missing something? (Quite probable!)