As the bitcoin prices are really unstable for the time. You will be risking your fiat by holding/buying bitcoins. The best option to make an investment is to hold/buy NXT coins as they are running a promotion.

They are giving away free ARDOR coins on the average balance of NXT you have on your wallet. 
To get more details about the promotion you check out on the link down below.
https://www.mystellar.org/thread-154.html