I like diversification. I think BTC is likely to be the best long term, so I am putting a decent amount away. Currently USD is easiest to use for paying basic bills, so I have some of that. Gold/silver are good stores of value and although they don't work well for very small/large or distant transactions, they aren't going to lose value and will work in situations where BTC can't (no power, no internet) and when cash won't (hyperinflation). Having some of all 3 puts me in an optimal position in all situations.