They are both volatile and unpredictable, any investment could easily be wiped out in a day or week, and there is the added challenge of having to maintain and

They are both volatile and unpredictable, any investment could easily be wiped out in a day or week, and there is the added challenge of having to maintain and secure one’s own keys and use privacy preserving tools and techniques. But if you are OK with all that, ETH and BTC are fine investments for those seeking to self-manage a high risk high reward portfolio, and ofc. for only a small percentage of net wealth but I would argue against BTC on the grounds of PoW energy waste - keeping your portfolio greener - and the fact that ETH is able to achieve the same international digital-gold-like properties but with better cryptographic tech, interoperability and privacy features. It is hard to see the long term 10 years BTC thesis - maybe only scenario where it continues to surpass ETH is if PoS proves to be an untenable consensus mechanism.