Saving and investing is the most default ways of getting profit but when we talking about bitcoin always better to choose investing because price is volatile and you can win on this.
I agree that in terms of the cryptocurrencies then it is better to just invest because you will be having higher chance to make money with your cryptocurrencies rather than saving them into a wallet. It also the same in the fiat because you cannot get good benefits if you will just rely on savings and not doing any of the investments.
Saving is good and you protect the money you have but the return is really small there and there is inflation. Thus, investment is a mandatory action.