Compared to any type of investment, I think that the bank is the relatively safest place to keep your money. Although it will never grow and you will in fact lose money due to the ever decreasing buying power of money.
On the other hand, ICO investing is the most risky in all of crypto investing, but is the most rewarding imo. I plan to invest in projects like Menlo one and WePower as they have high potential as projects and could even be long term investments.