Don’t know what will be the most negotiable form of silver, but it looks to be the most practical metal for a medium of exchange when (not if) we have a currency collapse.
Now, if we end up in a state of anarchy, who knows? Food stuffs and water could be the medium of exchange. Can’t do everything with barter.
Anyway, it will be something besides paper money, you can bet on that.
Silver is good, too.
The only issue I have with silver is that it does not carry the same proportionate value per ounce. Please note my earlier posting on portability.
With silver, you would have to carry a pretty big box to equal the same investment you would have in a single gold coin. An overly-large investment in silver puts you in the same position as would an investment in Real Estate —you have to defend it.
As for Platinum and Palladium, their primary value is due to their use as industrial metals, and I do not consider them to be appropriate for survivalists.