I believe bitcoin and banks are well renounced investment platforms but many people prefer bitcoin investment despite is very risky because of high demands and rising price interest and banks on the other hand saves millions of people finances all over the world yet their investment interest is very small but less risky than bitcoin. Which do you preferred your money to be save in as investment? Bitcoin or bank! What's your reason?
Depending on which bank and in which country you live. Private bank or state. A lot depends on this.
We should to understand what the goals you want to achieve. If you want to invest in long time, I'd say that bitcoin is better, than bank. If you need to save your money for a short time, maybe the reliable bank would be better, because bitcoin price can be grow or fall and we don't know it for sure. So, we need to know your aims, a lot depends on it.
Neither bitcoin nor bank not will reliable for 100%. Both have their downsides. The bank may go bankrupt and the volatility of bitcoin has not been canceled
It's just my point of view.