For me it's better you choose investment because you invest your money or bitcoin you take the risk and that risk had high possibility to earn. While if you save your money or bitcoin you are not practically business minded because you were only wait to your money or bitcoin even you have no do to earn it.
i would also like to choose investment. although saving is also important i would like to save a small amount of money.
I think spending money is like a gambling you have a 50-50 chance to earn profit, because you don't know if the investment you choose is will become successful. But I think if you invest just include the hard work to assure that you can gain profit. While in savings it was stock only in the wallet and wait the fluctuation of bitcoin in the market. It is the strategy of rich people they stock money for a long run of time and they only wait the right time before they withdraw it.