I do a combination of items because I don't believe anyone can fully predict how a post official banking system world will behave. I have a bunch of junk silver, mostly dimes and quarters, because Washington and Delano are so recognizable. I also have halves and fulls but they aren't for numismatic value, although many are good to fine class.
I do carry some fully numismatic silver stuff that holds high value provided someone grades it or cares about the luster/certs. A gamble in a post banking system world. Waiting for someone who will barter you a higher price for a certed coin seems risky to me. A few years back I converted a bunch of proof sets, mint sets and similar numismatic stuff to junk and haven't regretted it. Today's folks are mostly dumbed-down but I'm sure they will recognize George but perhaps not so much Eisenhower. My 2 cents.
I do have a few pieces of gold but they are the .10 oz pieces. I've never found buying full oz gold to be affordable and would likely be a nightmare to unload if stuff collapses.
This is topside so I won't delve into where to put things discussion. All of mine is in a bank vault anyway. I'm sure everyone else's is as well.