Between Bitcoin investment and banking it has its own advantages and disadvantages, but I personally choose to use both of them to diversify my investments. Because keep in mind that when you put your investment in one basket your risk of losing will be much greater. But when you diversify, your chances of losing are much smaller. Moreover, investing in Bitcoin tends to be more unstable than what is offered by banks, so investing in a bank is only for a backup investment, if you lose on a Bitcoin investment you still have other investments running in the bank.
Personally, more advantage when holding money in Bitcoin than banking investment, when deposit fund in banking account as investment we get rule not available unlock until ended of time period and profit interest around 8% until 10% every year. Its seems very small amount of profitable than hold in Bitcoin, but another advantage with banking investment never get risk with our capital drop values than Bitcoin investment has opportunity when price dropping.
I don't doubt for choosing and priority with hold my fund in bitcoin than saving as banking investment with small profitable earn every year. I think when using banking investment of our money cannot cover the inflation rate that will occur in the next two or four years according to the duration of the deposit we choose.