It is not a difficult question to answer that bank investment is a lot more safer than bitcoin. But as we all know that bank is investment is not as profitable as bitcoin. And it is a slow process indeed to invest in banking policies. So now people are investing on bitcoin more than bank.
Yes, Bitcoin investment is more risky than bank investment because in Bitcoin investment, you have bo assurance on what's happening in your money; unlike in bank, you monitor the increase of your money.