This two option of investment is both good and risky, but in banks you can earn just a small percentage from you investment even in a very long years, whereas in bitcoin it maybe your investment fold into multiple times even in a short period of time, but it is depend on the investor on which he is prepared to invest.
The statement makes Bitcoin more risky than banks. Volatility has been Bitcoin's advantage over other investments, however, this this has been its disadvantage for the reason that Bitcoin could not guarantee a huge gain as time passes.