Cryptocurrency is much more riskier than Stock Market because we tend to have the control in our investments and if we make a mistake in our trades and transactions, there is a big chance of losing our investments so we have to be careful and be really knowledgeable to know how to handle the business in cryptocurrency.
Yes there are a lot of risks in crypto currency world. But high risk lead to high return also, that is why a lot people like trading cryptos. You can also diversity your investment to have both stock and crypto currency.