Of course the easiest answer is Bitcoin. Because of what? because the value of Bitcoin is even worse but still valuable. Especially for crypto coin owners who get it for free because of a donation or work hard through the faucet and a Bitcoin multiplier account. The decline in the value of Bitcoin remains an advantage for crypto players like that. And if forced to present 2 choices, the second thing is of course between ETH and BCH because both (apparently) are direct derivatives of Bitcoin so the altcoin price is relatively stable following the price of Bitcoin. This is my version.