It’s difficult to decide even within a certain period or Age, let alone across many decades.
For example, as an EC fan, would I choose something approaching fine art, such as Frazetta’s Weird Science-Fantasy 29, or something more primal and visceral such as Craig’s Crime Suspenstories 22?
Would proof of our legacy matter either way, as the wasteful environmental consequences of turning trees into pamphlets might be the only concern about such a product by then, and physical copies, regardless of the artistry shown by any cover set we choose, might simply be mocked as caveman-primitive, Luddite and ignorant?