Investing is risk but it gives you profit and if the price of Bitcoin is going up so you will get multiples profit.
Saving only make you safe but less profit then investing. Risk = Rich. I vote for investing.
Well, there isn't being held a comparison here. But if you ask me, then my vote is neither with saving nor with investing...

It is with earning, earning bitcoins without any investment and then saving them for future, waiting for the prices to rise regardless of the rate and downfalls...

Great and I m seeing this that it seems you've doubled your capital already and though it would take more time I think it would be better to still hold on to your bitcoins for now. I think the best is still a hard of us and your BTcs may be a lot more valuable in a couple of months or by the end of this year.