In all honesty, I think BTC investment is riskier. A bank investment is always 100% gonna make you profit, but the downside of that is that you have a very very long ROI.
When it comes to BTC, if the price goes up, the ROI is instant, if it goes down, you have to wait certain amount of time for it to get back to its original value ( the value it had when you invested ) and then wait for a spike up in price.
if you say bitcoin is more risky, what if your money in the bank is stolen robber? if you say bitcoin is more risky seen from the price point of view maybe you have never felt how big the investment profit in bitcoin