Assuming that the hexagons are regular then in terms of infinite packing both are 100% efficient so there is nothing to choose between them. For finite packing, however, the shape of the overall space becomes relevant and without detailed information about that it is not possible to answer the question.
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A hexagonal prism has 6 rectangular faces.
A rectangular prism has 6 faces while a hexagonal prism has 8 faces.
A hexagonal prism is a prism composed of two hexagonal bases and six rectangular sides.
A hexagonal prism has 6 rectangular faces.
A hexagonal prism has 6 rectangular faces and 2 hexagonal faces. Since it has 8 faces in total, it is a type of irregular octahedron, however it is correctly classified as a prismatic uniform polyhedron to avoid ambiguity with the regular octahedron with triangular faces. The hexagonal prism forms the basis of the hexagonal prismatic honeycomb.