Physical Metals > Paper Metals.
Coins > Bullion > Bars.
Personal Storage > Bank Storage.
The problem is that after the United States decoupled the dollar from physical gold most of the world followed their lead.
Getting anything other than coins from a secondhand dealer is a bitch with a bunch of traceable strings attached in a lot of jurisdictions these days.
Confiscations has happened before, and will happen again.
Truth be told, gold, platinum, palladium are way too much of a hassle in terms of value dissonance and upfront costs for run of the mill investors.
I like silver personally.
Buying a roll of silver coins every once in a while adds up over time, doesn't nuke your wallet, and dodges historical confiscations since it's all GOLD GOLD GOLD when it happens.
Fun Fact:
There are silver coins still in circulation if you know what to look for.
1964 and older for for the US.
1967/1968 and older for Canada.
All over the map for Mexico. See link below.
http://www.coinflation.com/unitedstates/.
Archive.
http://www.coinflation.com/canada/.
Archive.
http://www.coinflation.com/mexico/.
Archive.
http://www.coinflation.com/