Although both are at risk, i think it is more risky bitcoin in the bank if investing in it. Because if i see for example we invest in the bank of course we can get a change of the losses we will get from the bank. If we invest in bitcoin surely we will be confused who will be responsible for the loss?
I think both kind of investments are risky. Even banks may tend to bankruptcy and the money that you invested on it will be gone. I think the only reason why bitcoin is also risky, its because of volatility of the value of it. But, of course bitcoin may go up to its peak or maximum equivalent to traditional currency.