The intrinsic/true value of all crypto is 0. That's not hyperbole, that's just an objective fact about any virtual currency. I guess the same is true of fiat money too.

In any big disaster scenario where society collapses, it's likely they would both become equally worthless pretty much immediately. Even if the internet somehow continued running, no one would be interested in your crypto.

As soon as there is scarcity and insecurity on that scale, physical goods are all that matters.

It's possible that gold could come into use, but you'd have to be confident that other people are interested in it before taking it yourself in an exchange, because you may end up starving to death on a pile of shiny metal otherwise.