BTC - the king of crypto and perhaps most assured to retain value, will still encounter bubbles/corrections/whatever you choose to call them. In the end, it is likely more stable than the U.S. Dollar and while I'd recommend most put an equal or greater % (depending on their age, ability to tolerate risk/loss/hodl) into something more stable (PHYSICAL silver and gold NOT paper of the same). ETH will present a very significant challenge and may surpass BTC in the future, but for the next 1-2yrs minimum - BTC is the best bet.
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