In my opinion it's better to invest than save. The market is open for any investment available. BTC, ETH and other altcoins. Investing in cryptocurrencies is indeed good, however you should be well aware of the market.
It depends what kind of investment would we choose, if we would invest here in bitcoin it is advisable to do so than making your money stuck up in a bank which does not even give you a better return, so for me it is better to invest although not all but at least some part of your money should be invested.