Just in case anyone is still on the fence regarding where to store your savings, this table should help.
Details can be found in Vijay’s “The Bullish Case for Bitcoin” book. 
Discussion
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Actually, I think Bitcoin is more fungible than gold. Specially when you don't have the proper tools to verify the purity.
A common tatics on war/dirty governments was to mix metals to produce more "gold" or "silver" coins with decreasing purity
You wouldn't want to funge your good coins with dirty coins.
Bitcoin gets a B here cause of three letter agencies marking coins tainted and preventing free exchange of such coins. Coins are A+ fungible on the protocol level of course.
Hope I get to see the days when bitcoin’s fungibility is unquestionable.